The MaxxDry™ heavy duty uses "forced air" technology to gently dry four garments in about 1 hr. Dry and warm boots and gloves together. The heavy duty works quickly to remove moisture and perspiration, thereby reducing the growth of bacteria and mold the primary causes of odor. It includes everything to dry any two-pair combination of tall and short boots, gloves or shoes. With an option for mild heat or no heat at all, the heavy duty will not harm breathable Hypalon® or other linings, neoprene, polyester microfiber materials, woven nylon, expensive leather, canvas, vinyl, rubber, plastics or other man made materials. Enjoy warm, dry, comfortable boots and gloves with no stiffness, no shrinkage and no damage whatsoever.