Expedition Weight Long Underwear Beanie Hat, Advanced Polypropylene and Lycra Baselayer (Black) 95% Polypropylene/5% Lycra featuring 5 fabric treatments. Precision Top Design & Flat-seam Construction allow the beanie to lay comfortably on the head. Soft Brushed Interior for maximum comfort. Tagless Label prevents irritation. Moisture-wicking Fabric moves moisture to the exterior while still in the vapor stage. Head-forming Design fits just below the ears for maximum coverage.