The MaxxDry™ Heavy-Duty uses “Forced Air” technology to gently dry 4 garments in about 1 hour! 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 2 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.