ZANheadgear DC544 COOLDANNA 100% COTTON TRIBALIRON CROSS. The vendor part number is DC544. Read title to know what you are getting. Catalog descrition� Provides hours of cooling relief Soak in cold water for approximately 10 minutes to activate the cooling crystals Custom prints and designs Contains non-toxic polymer crystals Hand washable 100% Cotton Zip-lock bag included for on the go use - just add water to the bag