Utilizing a blend of First Lite's top-grade Merino wool and 37.5 infused fibers, the First Lite Men's Aerowool Neck Gaiter can be used to keep you both concealed and cool in the field. Dunk it in a stream and enjoy the AC. Pull it up over your face and ears and disappear into your surroundings. This little piece does it all. FeaturesSize: One Size Fits AllExclusive 37.5 Active Particle Technology Exhausts moisture and maintains core body temperature Traps odors (human signature) and releases them when laundered150g First Lite AerowoolMerino is naturally odor-resistantRetains warmth when soaking wetAerowool dries faster and is more durable than traditional Merino wool18" overall lengthMachine washable