Sealskinz waterproof cycle capthis waterproof cycle cap is the best selling sealskinz cap and is a classically styled 3 panel cycling cap designed for wearing under your helmet in wet weather featuresouter lining material 48 nylon 30 polyester 11 tpu 11 spandexinner lining material 100 polyestermembrane microporoustotally waterproof breathable and windproofmesh lined interior elasticated rear band to fit under your helmetshort stiff peak keeps rain and sun out of riders eyesbuy