Hydro Cool Compression BootsDescription Advanced, medical grade fabrics have been used to create a practical solution for leg cooling after strenuous exercise. Simply soak in water for 5 to 8 minutes (a maximum of 30 minutes), no need for ice or refrigeration. The material uses a unique chemistry to achieve rapid water absorption. The advanced formulation releases energy over time to provide temperatures that are 6 to 12 degrees cooler than ambient temperature. Sold in pairs.