Approximately 70cm wide and 40cm long. I used it for one winter. It was warm, and the cat seemed to like it, but I'm selling it because it doesn't have a timer. There is no switch; it turns on and off by plugging and unplugging it. When I bought it, there was no air in it, and it was designed to let air in by opening the air valve. (The air valve is not used except when purchased.) The cover is washable. I washed it. There are no stains, but there may be some cat hair attached. It was large enough for two cats, about 4 to 5 kg each, to lie side by side comfortably. Recommended for dogs too.