A full lining in both front and back is a supportive addition to the Nike Boys Poly Core Solid Briefs that won’t slow down young athletes for a moment. Not only does incredible comfort come as standard as a result, but the polyester used here is resistant to the wearing effects of chlorine for longer lasting shelf life, the fit features a drawcord for a fully adjustable fit, and the flat-seam construction help to do away with chafing for good, even during longer pool sessions.