ScentLok Men's Hunting Mock Tee 100% Polyester 100% Polyester|Flat-Lock seams for comfort|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.|MU|