The Grabber Warmer has an adhesive backing. This allows the Grabber Toe Heaters to stay exactly where you put them. Simply stick the Toe Heater to the outside of your sock, slip your foot into your boot or shoe and enjoy five long hours of nice, warm feet. No odor, just clean dry heat. They have been designed with a rounded toe for added comfort and convenience. Sold in individual packages of 2. For a complete box order 30.