Reebok Men's One Series Hex Thermal Speedwick 1/4 Zip Jacket 100% Polyester 100% Polyester, brushed HEX embossed fabric for insulating warmth. Slim Fit - wears close to the body and moves with you during exercise. Speedwick technology wicks sweat away from the body to help you stay cool and dry; High-stretch thermal fabric in key movement zones for range of motion. Softshell fabric at the center front for weather protection; Reflective details for visibility. HEXAWARM is lightweight, ultra-breathable layers that allow extra air flow to release excess heat and insulate against the cold.