Interior crystals absorb up to 1000 times their own weight to give you cooling relief for days. Reusable. 100% cotton exterior enhances evaporation, offering maximum comfort. Soft, flexible fabric is easy to use; just tie loosely in place. One size fits all. Available in six color choices—Blue Denim (No. 30762), Red Cowboy Print (No. 30763), Aztec Print (No. 30764), Navy Blue (No. 40157), Black (No. 40158), Desert Camouflage (No. 40159).