Model Number: 5BF-BJ17 Brand Name: BingFan Key Specifications/Special Features: Wear these cooling tie around your forehead or neck, and stay COOL for hours.Soak in very cold water for about 15-20 minutes, the crystals will turn into a gel.The crystals work just by soaking them in water and stay plump and hydrated for up to two full days.The crystals retain the coolness of the water and work together with the evaporation process against the skin to keep the wearer cool.After about two days, the crystals will need rehydrating as the evaporation process is continuously returning them to their original, dry state.

Cool wraps can be rehydrated at any time to plump the crystals back up and to bring the temperature down.

This product keeps a low temperature for a long time and absorbs the sweat. It prevents sunstroke and is an incredible solution in the hot weather.