The Fox Evolution 34 Liner won't just kick your on bike comfort up a notch it will extend your riding season a bit by covering up those knees to keep you warmer later into the season. In general, it's a practical and comfortable way to get more out of your rides. The liner is made out of Fox's own spandexnylon polyester blend that's designed to be both supportive and breathable, on the toughest climbs or roughest descents. The paneling of the liner is designed to keep in place the Evo chamois, which does dual jobs: keeping your undercarriage well padded and pulling away and evaporating excessive moisture ultimately keeping you more comfortable and for longer than you would be without it. The flatlock seams minimize irritation, too, and the silicone grippers around the legs' cuffs keep the liner in place. The Fox Evolution 34 Liner Men's is available in the color Black and in four sizes: Small, Medium, Large, and X Large.