Scruffs Cool Mat has been designed to help relieve your dog from hot summer temperatures for approximately 1 hour. The mat has been filed with a non-toxic gel which is typically 5 to 10 degrees cooler than room temperatures, great for large, thick furred dogs. The cooling properties are reset after an hour of no use. Size GuideSmall: 50 x 40 cmMedium: 77 x 62 cmLarge: 92 x 69 cmX Large: 120 x 75 cm