The All For Paws Chill Out Always Cool Dog Mat has a special cooling gel inner lining that keeps the mat surface cold even in the hot summer. All your dog needs to do is lay on the cooling pad and his temperature will decrease. No refrigeration is needed. The cooling gel inside the mat is activated by movement, and is non-toxic. Sizes available: Medium which measures 50cm x 40cm and Large that measures 90cm x 60cm.