21 inch; length, ties. Immediate pain relief. Medically recommended to relieve pain, tension and stiffness. Microwave for deep penetrating relief. No wires. No water. No waiting. No mess. Washable. Reusable. Odor free. Relieves pain naturally. Natural pain relief. Clinically proven. Fast acting. What makes ThermalOn different?: Everything! ThermalOn products are easy-to-use, portable and fast acting. ThermalOn delivers up to 30 minutes of medically prescribed moist heat after just a minute or two in the microwave. With ThermalOn, there is no waiting for all-day patches or pills to take effect. No drugs. No messy ointments or creams. No offensive odors. Patent pending ThermalOn goes to work to relieve pain immediately - just microwave and apply. Doctors, therapists and pharmacists recommend the moist heat therapy ThermalOn provides. The American heart association, for example, advises physicians to first treat chronic pain with heat or cold therapy along with diet and other non-drug solutions like exercise. Relieves pain, reduces tension and stress, enhances exercise. ThermalOn relieves pain fast. Recommended by doctors & pharmacists. Neck pain, shoulder pain, tension & stress, hip pain. Washable & reusable. Safe & easy to use. Non-allergenic. Non-toxic & latex free. No water needed. Odor & bacteria free. Microwave for moist heat: just a minute or two in the microwave delivers up to 30 minutes of preferred moist heat treatment. ThermalOn moist heat penetrates deeper than dry heat to increase circulation and flush away pain-causing chemicals. Natural hydration means you never have to add water. So there is no mess. Just microwave and apply. Patent pending ThermalOn brings skin temperature to the medically prescribed temperature range necessary to deliver effective pain relief. Advanced beaded technology. The patent pending beads in ThermalOn draw moisture from the air and release it as clean, deep-penetrating moist heat when microwaved - no need to add water.