In general, insulation in Japanese homes is poor, so that means during winter heating devices have to be constantly on, driving up heating bills and sapping the power grid. Though this winter is predicted to be warmer than most, many Japanese, aware of energy shortages, will be feeling more than usually chilly as they try to cut down on power consumption.

A traditional method of beating this problem is the kotatsu, a low table that has a heating element underneath and a warm blanket hanging down from all sides; by turning up the heat on legs and feet, the main heating device in the room can be turned down, thus saving energy. Modern methods of keeping nice and toasty without resorting to turning up the room heater are understandably catching on. We’ve compiled a list of the best:

King Jim’s Urapoka: This nifty heating device transforms your desk into a kotatsu. After attaching the heat-sealing flaps to the sides of your desk, simply pop the device under your feet to warm up those frozen toes. 30W, ¥7,329.