No Batteries, No Chemicals, No Gimmicks! Retains and reflects your body heat. Our NEW Jumbo 17" Heat-a-Seat cushions are filled with our NEW Insulsoft insulation that will keep you warm, dry and comfortable ALL DAY long. In fact, it's rated one of the best insulators on Earth! Unlike other crunchy and noisy hot seats, our Insulsoft shredded closed cell foam is quiet! Warm, Comfortable, Quiet, Durable, Lightweight, Water Resistant, Convenient Carry Handle.