AERO|TECH|DESIGNS Stretch Fleece Helmet Linder Skull Cap - Cold Weather Cap 80% Polyamide/20% Spandex Machine wash cold, air dry Unisex design insulates, wicks perspiration and keeps your head, forehead, ears, and neck warm Smooth flatlock seams with spandex binding around the edge Lightweight and easily packable Fits easily under your helmet and can also be worn jogging, walking, and hiking