Eco-friendly cool vest made with PVA material, providing long-lasting cooling effect without electricity. - Color: Blue - Material: PVA material - Features: No electricity required, eco-friendly material - Cooling effect: Long-lasting - Usage scenarios: Outdoor activities, sports Excerpt from product description at purchase: 【Physical Cooling & Requires Only Water】Applying water evaporation cooling technology, it can provide a long-lasting cool feeling. When water evaporates, it takes away a lot of heat from the body, and the temperature of the cool vest is maintained at 24°C! Just wet it with water, no need for cooling packs, no chemicals, no electricity, and no worries about running out of power or charging. 【Non-toxic & Safe Cooling Vest】Material: 100% synthetic fiber (PVA) Size: (approx.) 63CMx43CM Weight: approx. 300g. No preservatives, chemicals, or resins are used, making it environmentally friendly and harmless to the human body. Safe and secure cooling vest thanks to non-toxic technology. 【5-10 Hours of Cooling & How to Use & Reusable】Soak in water for about 3-5 minutes, and you can get a cool feeling for 5-10 hours. Soak the cool vest in ice water for 5 minutes, or put it in the refrigerator, and then wring it out lightly after absorbing plenty of water, and it will have a cooling effect. (It also works at room temperature). If you feel the cooling effect is diminishing, you can soak it in water again. After use, you can dry it and store it. 【Specifications & Warranty】● Size: (approx.) 60cm x 40cm ● Weight: approx. 300g (slightly wet) ● Material: PVA When shipping, it will be slightly wet to prevent damage during transportation. Please understand that this is not a product defect.