Come and see our amazing products. Soak in room temperature water for 5 minutes so that the vest can completely absorb. It will provide you with a comfortable cooling effect for 3-6 hours, instant cooling can cool down body temperature by 18F. Effect sunstroke prevention when working outside etc. Cooling the body only with the evaporation of water, not only economically realizing "power saving and preventing heat stroke", but also doesn't hinder the body when your construction work, cycling, running! Pls confirm with us about the packing info, stock color and exact production time before placing your order.