Elasto-Gel's Hot/Cold Therapy Wraps are designed to provide the best of moist heat and soothing cold therapies in one convenient product. Simply store the pack in the freezer for cold therapy. If you'd prefer to do a heat therapy treatment, simply microwave the neck pain pillow for 45 - 60 seconds and get intense moist heat therapy. The Hot/Cold Therapy Wraps feature a smooth nylon cover that is soft and pliable, allowing for complete contact. These Wraps are ideal for minor muscular and soft tissue injuries.