Thermal Defender is the Performance Gear for eliminates the need to wear heavy, bulky gear in cold weather. Warm, Quick Dry & Light Weight. The technology of Defender Skin Polyester 92%, Spandex 8% / Heat retention in Winter. Water Metastases layer / Water Absorption layer / Quick time Dry / TWC-WAY Air Circulation. UVA/UVB Protection Protects your skin from UVA/UVB radiation during your outdoor workout.