The Kathmandu 2-Pack Cooling Scarf is a hot weather must-have. The outer shell is made of 100% cotton. As for the inside, it is made with non-toxic, crystal polymer which absorbs moisture making this product ideal for trekking, long walks, and cycling in warm weather conditions. Submerge the scarf in cool water before tying it around your neck or head for lasting coolness. Refrigerate or freeze to enhance a longer lasting effect. reusable.