The INUTEQ-DRY evaporative cooling vest is a comfortable, full-fashioned lightweight vest. No refrigeration, additional gels or chemicals needed. The vest will reduce heat stress and fatigue, allowing you to perform better. This product performs best in low to medium humidity. The level of airflow determines the cooling effect. The INUTEQ-DRY evaporative cooling vest can be (re-)activated with tap water (500 ml. maximum - do not overfill). Cooling starts immediately. Incorporates a unique cooling technology, Stays 100% dry in and outside, Machine washable and has an MICROBAN antibacterial treatment, Easy to use and re-use is easy to use and re-use, Lightweight, non-toxic and durable, Provides up to 15 C cooling relief below ambient temperature, Offers from 8 up to 72 hours of cooling comfortComponents:Exterior: INUTEQ-DRY Nylon Jersey 50%, PU 50%, MICROBAN Antibacterial treatmentCore: INUTEQ-DRY technology wickingpolyester fleeceInterior: INUTEQ-DRY Nylon