HEADLINE IT! Helmet Liners are the ULTIMATE SWEAT PROTECTION! It is the #1 Accessory for Fighting Heat/Cold Stress & Adding Safety. For use in hard hats, bump caps, helmets, hats, and all headwear items. Use at an average of 10-14 days. 10 individually wrapped liners per box and one size fits all. SAFETY- hands-free sweat protection COOLING- regulates core body temperature COMFORT- ultra thin, high tech wick wear ODOR FREE- locks in oils, salts & odors HYGIENE- eliminates sweat stains HEALTH- reduces acne & irritations CLEAR VISION- stops dripping sweat Use 2 liners for Maximum Sweat Protection; 1 liner in front of helmet & 1 in back. Only apply to a clean, dry area. Wipe away oils and debris, before applying liners. Just PEEL, PLACE, STICK, & REPLACE.