That's A Wrap Men's Glows In The Dark Skull Under Wrap, Solid Black UWGLDK 100% Cotton Recharge the skull under any light bulb for 30 seconds and let it glow time after time No more helmet head! No ties required! Content: 92% Cotton/8% Lycra Exclusive "under wrap" is great for wearing with or without a helmet When worn under your helmet, it lessens the wear and tear and also helps protect the helmet's lining from perspiration and odor build-up. When worn without a helmet, our "famous fit" and "road-ready" looks keep this versatile "wrap" the choice mile after mile