SEALSKINZ 100% WATERPROOF - Windproof, Breathable - Beanie hat ideal for walking fishing hiking climbing road cycling mountain biking MTB and activities in cold weather conditions Outer: 100% Acrylic; Inner: 100% Polyester Imported Totally waterproof, windproof and breathable Acrylic knitted outer provides maximum water Repellency Micro-fleece lining gives warmth and moisture control