Designed for use in professional practices, hospitals and clinics Microwaveable moist heat pack Therapeutic range correlates to a skin temperature between 40 and 45 degrees Celsius Wraps around neck Color-coded zones indicate temperature range Durable, long-life fabric emits heat through 1 side only maximizing moist heat therapy Latex Free Provides instantaneous MOIST heat again & again. Re-absorbs moisture between treatments ready for the next use. NO preparation other than placing it in a microwave. Contains Microwaveable Therabeads, a revolutionary, patented formulation that is non-toxic and reusable. May be used over and over again.