Health Benefits -- Neck brace can effectively dredge meridians. improve blood circulation. promote metabolism. and help to clear the meridians. enhance immunity. Comfortable Material -- Made of high quality OK cloth + tourmaline + self-heating strap. is lightweight. soft. skin-friendly. breathable. comfortable. warm and durable. very easy to wear. One Size fits Most -- 45*9.5 cm/17.5*3.7inch. one size fits for most of men and women. Grey and red size: 43*10cm/16.8*3.9inch. fits for most of womens Relief Work Fatigue -- Built-in permanent life magnet and magnets work on the neck points.promote blood circulation. and relieve our cervical discomfort.especially after we sit in front of a computer for a long time. Portable Easy to use -- Small enough to keep in your handbag wherever you go. its always within easy reach when you need it. its great and very comfortable to wear for acute pain. muscle spasms. chronic stiffness and tension in the head area