Iso-Chill fabric helps disperse body heat, making it feel cool to the touch. ArmourVentTM mesh panels deliver true breathability in a light, stretchy, durable, fast-drying fabric. 4-way stretch fabrication allows greater mobility & maintains shape. Moisture Transport System wicks sweat away from the body. Anti-odor technology prevents the growth of odor causing microbes. Fully bonded seams allow chafe-free movement. Body: 4.5 oz. Nylon/Elastane. Back Mesh: Nylon/Elastane. Side Mesh: 4.4 oz. Polyester. Imported.