This cooling bandana is made of a special material that effectively absorbs and locks in water, slowly releasing it through evaporation, keeping your dog cool for 2-6 hours! No soaking or freezing required. Just wet, wring excess water, and use. Keeps your dog cool on hot summer days. Reusable and hand washable. Promotes highly effective evaporative cooling action. Materials: Polyester and cotton blend with powered jade ore incorporated into fabric. Medium/Large (20.5"L x 3.25"W).