LONG LASTING: Instant relief from neck, shoulder, and head pain for up to 45 minutes of long lasting cold. A great treatment for neck and muscle tension, irritation and swelling. Helps treat pain and prevent or relieve headaches. Can be used at home or in the office. FLEXIBLE MATERIAL: The material used remains flexible when frozen, emphasizing comfort and durability. Flows over the neck and shoulders with ease. Lightweight and convenient to carry around, the black mesh material is soft and malleable. Sits comfortable on your neck and can be adjusted to be draped over your shoulders. COLD OR HOT: It's therapeutic design makes this neck wrap microwaveable or freezable providing cold or hot relief from any pain. It's long lasting and easy to use, and rapidly transitions from from one temperature to another. Use the hot pad to relax muscle tension and the icepack to reduce swelling.