ScentLok Men's Lined Cap 100% Polyester Scent-Lok activated carbon virtually eliminates odor and substantially reduces the chance of being detected. Activate garment before use in the field. Place in household dryer on high heat for 40 mins; immediately store in an air tight container. For best results store in Scent-Lok lined bag. Repeat process every 30-40 hrs of use. Do not use commercial dryers. Activate garment before use in the field. Place in household dryer on high heat for 40 mins; immediately store in an air tight container. For best results store in Scent-Lok lined bag. Repeat process every 30-40 hrs of use. Do not use commercial dryers. CN