This renewed Inuteq-Dry evaporative cooling vest is a comfortable, full-fashioned and lightweight vest. By just putting normal water (max. 500ml) inside the cooling vest, cooling will start right away. The cooling effect will last from 8 hours up to 3 days depending on ambient temperature, airflow and humidity. No refrigeration or additional gels or chemicals are required. The vest will reduce heat stress and fatigue, allowing you to perform better. Due to our patented system, the vest will not become wet or soggy, making it suitable for wear underneath clothing. The cooling effect is based on an age old principal of cooling by evaporation. The cooling effect will last from 8 hours up to 3 days depending on temperature and humidity. Your skin will cool down between 5 and 15 degrees Celsius. The Bodycool Smart can be (re-) activated with tap water. Cooling starts immediately. 1) Fill with 500ml water 2) Distribute the water evenly and squeeze out any excess water 3) Enjoy immediate cooling Features: Incorporates a unique cooling technology stays 100% dry inside and out. Machine washable and has antibacterial properties Easy to use and re-use Lightweight, non-toxic and durable Provides up to 15ºC cooling relief below ambient temperature Offers up to 3 days of cooling comfort CE-marked Exterior: Inuteq-Dry Nylon Jersey 50%, PU 50% - Ultra Fresh Antibacterial treatment. Core: Inuteq-Dry technology wicking polyester fleece. Interior: Inuteq-Dry Nylon. Markets: Work, Leisure, Motorcycling, Military, Healthcare, Wellness Technology: DRY Sizing T-shirt size = cooling vest size. Just take your T-shirt size as a reference to determine your cooling vest size. Inuteq Bodycool Smart-X Evaporative Cooling Vest