This heated cat bed earned The Best rating from the Hammacher Schlemmer Institute after a cat behaviorist concluded that pets preferred it to all other models. Over a three-month period the cat behaviorist observed that the felines returned repeatedly to The Best model because of its cozy, semi-enclosed design and superior heater. Lesser models were barely warm to the touch and did not provide any privacy. The Best model's dual internal thermostats keep the bed temperature 12º F to 15º F above the ambient temperature and the bed is lined with 1" of soft foam and has a plush fleece surface. The Best model's heating element removes easily from a zippered pocket and the rest of the unit is machine washable, unlike lesser models that had to be washed by hand. For cats weighing up to 20 lbs. Plugs into AC. Sage or Mocha. 13" H x 16" sq. (1 1/2 lbs.)