Abus Motrip MTB Cycling HelmetA brilliant introduction to the world of Abus mountain bike helmets, the Motrip MTB Cycling Helmet is packed with features to keep both new riders and experienced riders safer on the trails.Whether you're just getting into the thrills of mountain bike riding or perhaps you're a more experienced rider on a tight budget, the Motrip MTB Cycling Helmet has everything you need as you take to the swooping, whooping, twisting and turning of fun trails. The first-rate protection is made possible via the use of Abus' In-Mould construction. This sees a shock-absorbing inner EPS foam liner bonded to a tough and durable outer shell. In the event of an impact, the EPS inner soaks up and dissipates harmful impact forces. Meanwhile, the outer shell provides both structural strength and the durability to fend off the minor bumps and bashes you'll get from riding off-road. Zoom Ace MTB adjustment systemA good fitting helmet is essential for both safety and comfort. And here the Motrip's Zoom Ace adjustment system makes it easy to get the perfect fit. With the rear dial and the built-in height adjustment, you'll be able to get a secure fit every time you ride. And with ponytail compatibility, long hair isn't going to prevent a good fit either. Cool ComfortAs you build speed and confidence, you'll quickly be pushing your ride limits and working up a good sweat. But with 6 inlet vents and 8 exhaust vents you can look forward to cool airflow as you pick up the pace. Trail ReadyThe Motrip MTB features a height-adjustable visor, letting you get it in just the right place for your preference. In its uppermost adjustment, it also makes space for pulling up and stowing goggles, ideal for moments when you're taking stock, catching your breath, and readying yourself for the next drop-in. Features:In-Mould for a permanent bond between the outer shell and the shock-absorbing helmet material (EPS)Zoom Ace MTB - Height-adjustable adjustment system to fit the head circumferencePonytail compatibility - Helmet well suited for ponytail wearersAdjustable strap dividerHeight-adjustable visorVentilation - excellent ventilation through 6 air inlets and 8 air outletsSize (head circumference) S - 51-55cm (weight 320g) / M - 54-58cm (weight 340g) / L - 57-61cm (weight 350g)Buy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus Kid's Smiley 3.0 Cycling HelmetThe third iteration of the ever-popular Smiley, the Abus Kid's Smiley 3.0 Cycling Helmet is packed with practical features to ensure your youngest two-wheeled fan stays safe and enjoys every moment of their ride.From their earliest pushes of a balance bike to the fun and freedom to go further on their first pedal bike, the Kid's Smiley 3.0 Cycling Helmet has everything they need for a safe ride. Protection of your child's head comes via the shock-absorbing EPS foam liner. Should they take a tumble, this soaks up and dissipates impact forces that could otherwise cause harm.The protective inner is then covered by a tough and durable outer shell, bonded to the EPS inner, ensuring minor knocks and bumps won't stop them from enjoying their ride. The extended design, covering the temple and back of the head, adds all-around protection too.Zoom Ace Kids adjustment systemA good fitting helmet is essential for both safety and comfort. And here the Smiley's Zoom Ace Kids adjustment system makes it easy to get the perfect fit. With the rear adjustment dial, you'll be able to get a secure fit every time they hop on their bike. And with ponytail compatibility and height adjustment, long hair isn't going to prevent a good fit either.Cool ComfortAs they build confidence and speed, your young rider will soon be getting a bit hot and sweaty. But with 4 inlet vents and 4 exhaust vents they can look forward to cool airflow as they pick up the pace. The internal padding offers cushioned comfort and it's removable too, making it easy to keep their Smiley feeling fresh and new.Features:In-Mould for a permanent bond between the outer shell and the shock-absorbing helmet material (EPS)The helmet extends into the temple and neck area for better all-round protectionHeight-adjustable adjustment system with ponytail compatibility for riders with longer hairZoom Ace Kids - height-adjustable adjustment system with non-slip adjustment wheel at the back of the headThe size is adjusted via a ring made of robust and flexible plastic for optimum stability and adaptabilityExcellent ventilation with 4 air inlets and 4 air outletsRemovable and washable padding provides maximum comfort for the wearerIntegrated fly netPassive safety thanks to reflectorsSize (head circumference) S - 45-50cm (weight 220g) / M - 50-55cm (weight 240g)Buy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus Gamechanger Road HelmetCycling fast takes good fitness. But if your cycling kit isn't aerodynamically optimised you're wasting precious watts. So starting at the head, the Abus Gamechanger Road Helmet offers a refined and aerodynamically efficient design. And it's outstanding when it comes to your safety too. Fast. In Any Position. The Gamechanger Road Helmet raises the bar when it comes to aerodynamic performance. The Multi-Position Design ensures a smooth flow of air over the helmet, no matter what your head-tilt position. This keeps drag levels as low as possible when you pick up speed. Abus' FlowStraps are also aerodynamically optimised, reducing flapping and fluttering in the wind. There's nothing holding you back with this helmet. Forced Air Cooling TechnologyRiding at speed generates heat. And if you get too hot your performance suffers. However, the Gamechangers overcomes overheating with its Forced Air Cooling Technology. This ventilation system is precisely engineered to enhance airflow across your head while not compromising the aerodynamics. Air is sucked in through front vents, flows along internal channels and exhausts through the back vents. Cool air is drawn in and damp, warm air is ejected, creating a perfect climate and keeping your head cool when intensity and temperatures rise. Safe at SpeedLast, but definitely not least, the Gamechanger provides outstanding protection should you be unfortunate to crash, always a possibility when racing. The multi-shell in-mould design combines a durable outer shell bonded to an EPS foam inner. Should you crash the foam liner absorbs and dissipates impact forces, keeping your head protected from injury. With its Zoom Ace adjustment system, you can also get a comfortable fit every time, and ensure a secure fit that won't move should you fall. Sleek, stylish, protective and cool, the Gamechanger Road Helmet is as good as it gets when it comes to high-level cycling performance. Features:Multi-Position Design: For optimal aerodynamics regardless of head tiltFlowStraps: Aerodynamic, flutter-free and skin-friendly thanks to specially developed strap profileForced Air Cooling Technology: Sophisticated ventilation system for an optimal head climateZoom Ace: Finely adjustable adjustment system with handy adjustment wheel for a customisable fitAirPort: Aerodynamic glasses holder with strap guideMulti Shell In Mold: For safe shock absorptionPonytail compatibility: Helmet well suited to plait wearersWeight:260gBuy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus Stormchaser Road HelmetCreated to take on a wide variety of cycling disciplines, the Stormchaser Road Helmet from Abus is a true all-rounder. Light, protective and stylish, it can take you from tough training session to intense criterium race to a muddy cyclocross event and even a daily bike commute. As with all of Abus' road helmets, the Stormchaser benefits from their In-Mould engineered construction. A durable polycarbonate shell provides every-day durability and this is bonded to an impact-absorbing EPS foam core. The outer shell wraps around the bottom of the helmet for added protection from knocks and bumps. The EPS core also features ActiCage, a reinforcing skeleton inside, allowing Abus to keep the weight low and boost the number of air vents without compromising safety.Talking of vents, the Stormchaser gets 23 in total. 7 air intake vents and 16 outlet vents are connected via cleverly arranged internal air channels, known as the Forced Air Cooling system. This creates a high degree of airflow across your head, keeping you cool, comfortable and as sweat-free as possible when the heat is high.To get a comfortable and precise fit is made easier with the Zoom Ace system. With both height and width adjustment, you'll be able to fine-tune the fit to suit your head shape. And with an overall weight of a mere 240 grams, the Stormchaser isn't going to be too noticeable once you start turning the pedals.Features:In-Mould: Lightweight, durable helmet with a long-lasting combination of EPS core and Polycarbonate shellActiCage: a structural reinforcement built into the EPSPonytail compatibility: Perfect fit for people with long hairZoom Ace: Finely tuneable retention system with height and length adjustment for a customisable fitLower edge protection: Provides the helmet with additional protection from external damageExcellent ventilation with 7 air inlets and 16 air outletsForced Air Cooling: Innovative ventilation system using intelligently arranged air channels in the EPSHigh visibility: High visibility due to reflectorsAirPort: Aerodynamic glasses holder with earpiece guideWeight: 240gBuy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus Youth Youn-I 2.0 Cycling HelmetDesigned for young riders and also those adults with smaller head sizes, the Youth Youn-I 2.0 Cycling Helmet packs in plenty of features to not only provide outstanding head protection but also excellent comfort.With a refined look suited to the modern cyclist, the Youth Youn-I 2.0 Cycling Helmet is at home on leisure rides, commutes to school or work and for a bit of urban exploration. The in-mould technology fuses a tough and durable outer to an EPS foam core. The EPS core provides shock absorption and impact protection while the durable outer ensures the Youn-I can easily take the demands of daily use in its stride. All-round protection is also enhanced thanks to the deeper temple and rear.Safety features continue by the way of a built-in rear LED light. This offers 180-degrees of visibility during day and night. It works alongside reflective details ensuring you're easier to spot on the road. Once you're on your bike and riding, the 17 air vents keep you cooler and more comfortable. Inner flow channels direct air over your head, drawing in cool air and pushing out warm, moist air to prevent discomfort. Getting the right fit is easy too. The rear dial allows quick adjustment and a form-fitting inner ring hold the Youn-I securely in place.Features:In-Mould technology - outer shell fused with shock-absorbing helmet material (EPS)Visor-like front edge ensuring enhanced protection for the faceDeep temple and neck area for increased all-round protectionFull shell reduces damage caused by the typical activities of a childZoom Evo Kids - precise adjustment system with an easy-to-grip adjustment wheelLarge integrated rear LED light in a high position with 180-degree visibility + passive safety thanks to reflectorsSize adjustment- full ring made from hard-wearing and mouldable plastic for optimum stability and form-fittingExcellent ventilation with 5 air inlets and 12 air outlets connected by flow channelsFoamed-in fly netWeight: 240g (S), 260g (M)Buy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus MountZ Youth Cycling HelmetBe it a weekend mountain bike adventure or the daily ride to school, the Abus MountZ Youth Cycling Helmet provides young cyclists with stylish and protective performance whenever and wherever they pedal.At the heart of the high-quality MountZ Youth Cycling Helmet is Abus' protective In-Mould design technology. This construction technique has allowed Abus to keep the weight low but protection levels high. An EPS foam core provides vital shock-absorbing protection from impacts to the head during a crash.Bonded to the inner is a structurally strong and durable polycarbonate outer shell. This fends off those inevitable knocks and bumps you get from low overhanging branches and trailside overgrowth. It also adds durability from the every day (ab)use it will see from keen young cyclists.Cool ComfortAs young riders build speed and confidence, they'll quickly be pushing their ride limits and working up a good sweat. But with 5 inlet vents and 8 exhaust vents, they can look forward to cool airflow as the pace hots up. There's also a built-in bug mesh, keeping out those buzzing nasties while zooming along the trails. Zoom Ace Urban adjustment systemA good fitting helmet is essential for both safety and comfort. And here the Zoom Ace adjustment system makes it easy to get the fit just ride. With the rear dial attached to a full head ring, it's remarkably easy to get a secure and comfortable fit on every ride. It's ponytail compatible too, so long hair won't get in the way of comfort.Features:In-Mould - Lightweight, durable helmet with a long-lasting combination of EPS core and Polycarbonate shellBug mesh - Full protection from insectsPonytail compatibility - Perfect fit for people with long hairExcellent ventilation with 5 air inlets and 8 air outletsZoom Ace Urban - Finely adjustable adjustment system with handy adjustment wheel for a customisable fitAdjustable ring connected to adjustment system enclosing all of the headSize (head circumference) S - 48-54cm (weight 245g) / M - 52-57cm (weight 280g)Buy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus Airbreaker Road HelmetCreated for cycling fast, the Abus Airbreaker Road Helmet delivers optimised aerodynamics so you're not held back. And the Multi Speed design keeps you cool whether you're powering on the flat or toiling up a steep mountain climb. Fast. But Cool.The Airbreaker Road Helmet has been created for road cyclists who want smooth aerodynamics but don't want to compromise on keeping cool. This performance balance is made possible by Abus' Multi Speed design, offering the best possible aerodynamics and at the same time ensuring optimum ventilation.At slow speeds, such as found when climbing hills and mountains ventilation is maximised. However, as speeds increase aerodynamics take precedent. The Forced Air Cooling Technology of the Airbreaker features 11 inlet vents and 3 outlets, all connected via inner flow channels, creating turbo-charged airflow over the head. When you're riding hard you're not going to be overheating or getting too sweaty. Comfortably Protective.Head protection is, of course, superb too. The in-mould design sees a durable outer shell bonded to a shock-absorbing EPS core. In the event of a crash, this dissipates impact forces, protecting your head from injury. Inside the EPS core, the ActiCage Lite system provides structural support, allowing Abus to keep strip weight, optimise the size of the vents while still delivering exceptional protection. When you're on the bike and if you're involved in a crash a good fit is essential. And this is made easy with the Abus Zoom Ace adjustment system. An easy to reach adjustment wheel lets you get the very best fit, offering up all-ride comfort and security in a fall. At just 230 grams in weight and with airflow and aerodynamics perfectly balanced, the Airbreaker Road Helmet brings winning performance to your ride. Features:In-Mould for a durable connection with the outer shell with shock-absorbing helmet material (EPS)In-Mould for a durable connection with the outer shell with shock-absorbing helmet material(EPS)ActiCage Lite: A structural reinforcement integrated into the EPS liner. It provides maximum protection while ensuring optimal ventilation and extreme comfortForced Air Cooling Technology: Sophisticated ventilation system for an optimal head climateExcellent ventilation with 11 air inlets and 3 air outlets connected with flow channelsFlowStraps: Aerodynamic, flutter-free and skin-friendly thanks to specially developed strap profileZoom Ace: Finely adjustable adjustment system with handy adjustment wheel for a customisable fitAirPort: Aerodynamic glasses holder with strap guidePonytail compatibility: Helmet well suited to plait wearersWeight: 230gBuy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus Airbreaker Road HelmetCreated for cycling fast, the Abus Airbreaker Road Helmet delivers optimised aerodynamics so you're not held back. And the Multi Speed design keeps you cool whether you're powering on the flat or toiling up a steep mountain climb. Fast. But Cool.The Airbreaker Road Helmet has been created for road cyclists who want smooth aerodynamics but don't want to compromise on keeping cool. This performance balance is made possible by Abus' Multi Speed design, offering the best possible aerodynamics and at the same time ensuring optimum ventilation.At slow speeds, such as found when climbing hills and mountains ventilation is maximised. However, as speeds increase aerodynamics take precedent. The Forced Air Cooling Technology of the Airbreaker features 11 inlet vents and 3 outlets, all connected via inner flow channels, creating turbo-charged airflow over the head. When you're riding hard you're not going to be overheating or getting too sweaty. Comfortably Protective.Head protection is, of course, superb too. The in-mould design sees a durable outer shell bonded to a shock-absorbing EPS core. In the event of a crash, this dissipates impact forces, protecting your head from injury. Inside the EPS core, the ActiCage Lite system provides structural support, allowing Abus to keep strip weight, optimise the size of the vents while still delivering exceptional protection. When you're on the bike and if you're involved in a crash a good fit is essential. And this is made easy with the Abus Zoom Ace adjustment system. An easy to reach adjustment wheel lets you get the very best fit, offering up all-ride comfort and security in a fall. At just 230 grams in weight and with airflow and aerodynamics perfectly balanced, the Airbreaker Road Helmet brings winning performance to your ride. Features:In-Mould for a durable connection with the outer shell with shock-absorbing helmet material (EPS)In-Mould for a durable connection with the outer shell with shock-absorbing helmet material(EPS)ActiCage Lite: A structural reinforcement integrated into the EPS liner. It provides maximum protection while ensuring optimal ventilation and extreme comfortForced Air Cooling Technology: Sophisticated ventilation system for an optimal head climateExcellent ventilation with 11 air inlets and 3 air outlets connected with flow channelsFlowStraps: Aerodynamic, flutter-free and skin-friendly thanks to specially developed strap profileZoom Ace: Finely adjustable adjustment system with handy adjustment wheel for a customisable fitAirPort: Aerodynamic glasses holder with strap guidePonytail compatibility: Helmet well suited to plait wearersWeight: 230gBuy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus Gamechanger Road HelmetCycling fast takes good fitness. But if your cycling kit isn't aerodynamically optimised you're wasting precious watts. So starting at the head, the Abus Gamechanger Road Helmet offers a refined and aerodynamically efficient design. And it's outstanding when it comes to your safety too. Fast. In Any Position. The Gamechanger Road Helmet raises the bar when it comes to aerodynamic performance. The Multi-Position Design ensures a smooth flow of air over the helmet, no matter what your head-tilt position. This keeps drag levels as low as possible when you pick up speed. Abus' FlowStraps are also aerodynamically optimised, reducing flapping and fluttering in the wind. There's nothing holding you back with this helmet. Forced Air Cooling TechnologyRiding at speed generates heat. And if you get too hot your performance suffers. However, the Gamechangers overcomes overheating with its Forced Air Cooling Technology. This ventilation system is precisely engineered to enhance airflow across your head while not compromising the aerodynamics. Air is sucked in through front vents, flows along internal channels and exhausts through the back vents. Cool air is drawn in and damp, warm air is ejected, creating a perfect climate and keeping your head cool when intensity and temperatures rise. Safe at SpeedLast, but definitely not least, the Gamechanger provides outstanding protection should you be unfortunate to crash, always a possibility when racing. The multi-shell in-mould design combines a durable outer shell bonded to an EPS foam inner. Should you crash the foam liner absorbs and dissipates impact forces, keeping your head protected from injury. With its Zoom Ace adjustment system, you can also get a comfortable fit every time, and ensure a secure fit that won't move should you fall. Sleek, stylish, protective and cool, the Gamechanger Road Helmet is as good as it gets when it comes to high-level cycling performance. Features:Multi-Position Design: For optimal aerodynamics regardless of head tiltFlowStraps: Aerodynamic, flutter-free and skin-friendly thanks to specially developed strap profileForced Air Cooling Technology: Sophisticated ventilation system for an optimal head climateZoom Ace: Finely adjustable adjustment system with handy adjustment wheel for a customisable fitAirPort: Aerodynamic glasses holder with strap guideMulti Shell In Mold: For safe shock absorptionPonytail compatibility: Helmet well suited to plait wearersWeight:260gBuy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus Stormchaser Road HelmetCreated to take on a wide variety of cycling disciplines, the Stormchaser Road Helmet from Abus is a true all-rounder. Light, protective and stylish, it can take you from tough training session to intense criterium race to a muddy cyclocross event and even a daily bike commute. As with all of Abus' road helmets, the Stormchaser benefits from their In-Mould engineered construction. A durable polycarbonate shell provides every-day durability and this is bonded to an impact-absorbing EPS foam core. The outer shell wraps around the bottom of the helmet for added protection from knocks and bumps. The EPS core also features ActiCage, a reinforcing skeleton inside, allowing Abus to keep the weight low and boost the number of air vents without compromising safety.Talking of vents, the Stormchaser gets 23 in total. 7 air intake vents and 16 outlet vents are connected via cleverly arranged internal air channels, known as the Forced Air Cooling system. This creates a high degree of airflow across your head, keeping you cool, comfortable and as sweat-free as possible when the heat is high.To get a comfortable and precise fit is made easier with the Zoom Ace system. With both height and width adjustment, you'll be able to fine-tune the fit to suit your head shape. And with an overall weight of a mere 240 grams, the Stormchaser isn't going to be too noticeable once you start turning the pedals.Features:In-Mould: Lightweight, durable helmet with a long-lasting combination of EPS core and Polycarbonate shellActiCage: a structural reinforcement built into the EPSPonytail compatibility: Perfect fit for people with long hairZoom Ace: Finely tuneable retention system with height and length adjustment for a customisable fitLower edge protection: Provides the helmet with additional protection from external damageExcellent ventilation with 7 air inlets and 16 air outletsForced Air Cooling: Innovative ventilation system using intelligently arranged air channels in the EPSHigh visibility: High visibility due to reflectorsAirPort: Aerodynamic glasses holder with earpiece guideWeight: 240gBuy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus Airbreaker Road HelmetCreated for cycling fast, the Abus Airbreaker Road Helmet delivers optimised aerodynamics so you're not held back. And the Multi Speed design keeps you cool whether you're powering on the flat or toiling up a steep mountain climb. Fast. But Cool.The Airbreaker Road Helmet has been created for road cyclists who want smooth aerodynamics but don't want to compromise on keeping cool. This performance balance is made possible by Abus' Multi Speed design, offering the best possible aerodynamics and at the same time ensuring optimum ventilation.At slow speeds, such as found when climbing hills and mountains ventilation is maximised. However, as speeds increase aerodynamics take precedent. The Forced Air Cooling Technology of the Airbreaker features 11 inlet vents and 3 outlets, all connected via inner flow channels, creating turbo-charged airflow over the head. When you're riding hard you're not going to be overheating or getting too sweaty. Comfortably Protective.Head protection is, of course, superb too. The in-mould design sees a durable outer shell bonded to a shock-absorbing EPS core. In the event of a crash, this dissipates impact forces, protecting your head from injury. Inside the EPS core, the ActiCage Lite system provides structural support, allowing Abus to keep strip weight, optimise the size of the vents while still delivering exceptional protection. When you're on the bike and if you're involved in a crash a good fit is essential. And this is made easy with the Abus Zoom Ace adjustment system. An easy to reach adjustment wheel lets you get the very best fit, offering up all-ride comfort and security in a fall. At just 230 grams in weight and with airflow and aerodynamics perfectly balanced, the Airbreaker Road Helmet brings winning performance to your ride. Features:In-Mould for a durable connection with the outer shell with shock-absorbing helmet material (EPS)In-Mould for a durable connection with the outer shell with shock-absorbing helmet material(EPS)ActiCage Lite: A structural reinforcement integrated into the EPS liner. It provides maximum protection while ensuring optimal ventilation and extreme comfortForced Air Cooling Technology: Sophisticated ventilation system for an optimal head climateExcellent ventilation with 11 air inlets and 3 air outlets connected with flow channelsFlowStraps: Aerodynamic, flutter-free and skin-friendly thanks to specially developed strap profileZoom Ace: Finely adjustable adjustment system with handy adjustment wheel for a customisable fitAirPort: Aerodynamic glasses holder with strap guidePonytail compatibility: Helmet well suited to plait wearersWeight: 230gBuy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus MountZ Youth Cycling HelmetBe it a weekend mountain bike adventure or the daily ride to school, the Abus MountZ Youth Cycling Helmet provides young cyclists with stylish and protective performance whenever and wherever they pedal.At the heart of the high-quality MountZ Youth Cycling Helmet is Abus' protective In-Mould design technology. This construction technique has allowed Abus to keep the weight low but protection levels high. An EPS foam core provides vital shock-absorbing protection from impacts to the head during a crash.Bonded to the inner is a structurally strong and durable polycarbonate outer shell. This fends off those inevitable knocks and bumps you get from low overhanging branches and trailside overgrowth. It also adds durability from the every day (ab)use it will see from keen young cyclists.Cool ComfortAs young riders build speed and confidence, they'll quickly be pushing their ride limits and working up a good sweat. But with 5 inlet vents and 8 exhaust vents, they can look forward to cool airflow as the pace hots up. There's also a built-in bug mesh, keeping out those buzzing nasties while zooming along the trails. Zoom Ace Urban adjustment systemA good fitting helmet is essential for both safety and comfort. And here the Zoom Ace adjustment system makes it easy to get the fit just ride. With the rear dial attached to a full head ring, it's remarkably easy to get a secure and comfortable fit on every ride. It's ponytail compatible too, so long hair won't get in the way of comfort.Features:In-Mould - Lightweight, durable helmet with a long-lasting combination of EPS core and Polycarbonate shellBug mesh - Full protection from insectsPonytail compatibility - Perfect fit for people with long hairExcellent ventilation with 5 air inlets and 8 air outletsZoom Ace Urban - Finely adjustable adjustment system with handy adjustment wheel for a customisable fitAdjustable ring connected to adjustment system enclosing all of the headSize (head circumference) S - 48-54cm (weight 245g) / M - 52-57cm (weight 280g)Buy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.