Qore Performance Men's Half Sleeve System Garment: 85% Nylon/15% Spandex; Insert: Encapsulated PCM A new, virtually invisible weapon to help you fight dehydration and temperature extremes Includes ONE PFM HydraQore insert to keep you cool Zero athletic compromise: designed to be worn securely during any activity Moisture wicking, four-way stretch Nylon/Spandex blend for comfort and durability 100% Made in the USA