SHIMA HYDROCOOL is a lightweight and easy to use cooling vest. Simply soak the vest under water for 3 minutes, squeeze it gently and enjoy cooling your body for 6-8 hours. Thanks to the innovative HyperKewl™ PLUS material, the vest absorbs and slowly evaporates water. The HyperKewl™ PLUS technology works by absorbing water into the material which is placed between the waterproof inner liner and the ventilated outer fabric. When air flows through, the natural evaporation process creates a feeling of coolness. This lightweight and non-toxic material, can be machine washed without worrying about losing its properties. Featuring a front zip and EvoLink system, the vest is easy to wear and connect to the SHIMA jacket.