Polar Pad Gel Self Cooling Pet Pad - Pressure Activated Non-Toxic Bed Cooling Therapy for Dogs and Cats - Premium, Comfortable, Durable and Waterproof (LARGE) CONFORTABLE: Super Thick and Soft Gel Cushioning keeps your Pet Comfortable and Fresh. The cover adds an extra layer of Coziness when maximum cooling is not needed. SELF-COOLING: Automatically Recharging Cooling Pad (no need to freeze) Provides Continuous Relief For Up to 4 Hours! FAST RECHARGE by running cool water over the surface, placing in your refrigerator or even dunking it in an ice filled cooler if you are outdoors. SAFE: Non-Toxic, Completely Latex-Free Material, Chemical Free and Safe if ingested (although not recommended) PERFECT SIZE: Small: 15.5" x 19.75" / Medium: 19.75" x 26" / Large: 19.75" x 35" HEAVY DUTY: The outer layer consists of a very durable and heavy duty blend of nylon and polyester that does not contain acetate - Edges are double bound and sealed for extra durability. WATERPROOF: The Polar Pads foam core is surrounded by a waterproof membrane