DetailsWind is a fundamental byproduct of cycling, so managing it is seriously important, but not seriously easy. Gore Bike Wear's WindStopper Sleeveless Singlet Men's Base Layer makes it a little simpler, though, with a WindStopper membrane that cuts the wind and helps you stay warm when you use it as part of a wind-slaying layering system. While the front panel, shoulders, and sides are 100% windproof, the back of the base layer is made from polypropylene, which wicks moisture away from your skin to help you stay dry and warm. The wicking is boosted by the base layer's tight fight, which also allows for easy layering, and Gore joined all the panels with flatlock stitching, which helps eliminate the chafing and pressure points that can kill your comfort on a long ride. WindStopper membranePolyester and polypropylene fabricsForm fitFlatlock stitchingItem #GBW3268Tech SpecsMaterial[front face fabric] polyester, [front membrane/laminate] Windstopper, [back] 88% polypropylene, 8% elastane, 4% nylonFitform-fittingStylecrewRecommended Usecycling, mountain biking, fitnessManufacturer Warranty1 year