For their Celsius XC GTX winter boots, Northwave have turned to the Gore-Tex Pique membrane to give you an off-road shoe that is both windproof and waterproof. And not only does it keep cold wind and water out, but it also offers an excellent level of insulation against plunging winter temperatures. At the ankle, the flexible Easyfit Climaflex collar allows easy pedalling but with its Gore-Tex Rattler® membrane also prevents water from getting in. Inside the shoes, the 4-layer insole adds another layer of insulation from the cold, working with the Gore-Tex membrane to deliver outstanding warmth even when you're cycling in cold weather. Jaws Carbon Reinforced Sole With a stiffness rating of 8 out of 15, the Jaws Carbon-Reinforced Sole perfectly balances the need for efficient pedalling performance and comfort. Putting the power down results in rapid progress but the touch of flex in the sole provides absorption of vibration from rough trails and roads. The rubber grip provides traction off the bike and studs can be added for added grip on the muddiest of trails. SLW2 closure system Keeping the fit snug and comfortable, the SLW2 closure system allows you to dial in the fit just how you like it. The micro-adjust dial gives precise control of the fit but then at the end of a ride, a single button release makes it easy to kick off your shoes. Quick. Simple, Durable. Precise. And in conjunction with the Overlap design of the upper, a great fit without pressure points is made possible. Cleat Guidance These MTB shoes are compatible with MTB pedal systems, which use cleats with SPD standard (2-bolt standard), e.g.: Shimano SPD, Time ATAC, CrankBrothers, CrankBrothers Race, Look MTB, Xtreme MTB, Wellgo MTB, Ritchey MTB.