Pressure Activated Cool Pet Pad. Our Pressure Activated Cool Pet Pad is a revolutionary new self-cooling pet cushion that cools without refrigeration water or electricity. No maintenance no mess. Innovative pad is weight or pressure activated. As soon as your 4 legged friend lies down the cooling effect starts. It will stay cool for up to 3-4 hours of constant use and will last for years. Re-charges itself automatically after a brief period of non-use. How cool is that?! <Br>Features: - Ready to use - no refrigeration water or electricity needed - Stays cool for hours - Automatically re-charges - Cools and soothes - Great for pain swelling and aches - Fits in standard beds and crates - Perfect for cars - Wipes clean - Portable - Non-toxic Sizing: <b>S</b>: 11.8 x 15.7 <b>M</b>: 15.7 x 19.7 <b>M/L</b>: 20 x 30 <b>L</b>: 35 x 23.6 <b>XL</b>: 45 x 27.5