Features: Constructed of thin, strategically placed layers of super absorbent polymer Once saturated with water, polymer retains cold temperature and slowly disperses to keep you cool Strategic sections will keep your core temperature down longer helping to maximize your riding session Elastic shoulder attachment loops for race collar compatibility 4 Way Stretch KWIK-DRI - Fabric wicks sweat from skin and helps regulate core temperature 4 Way Stretch Airflow mesh Fabric on back panels 663-42452X