★ Free size (Velcro) ★ Black ★ Unisex ★ Easy to put on and take off with Velcro. ★ After wearing it for a while, you will feel warmth around your neck. (Due to self-heating, you may feel a tingling sensation or heat. If it feels too strong, please adjust by placing a towel, etc.) ★ Washable with water, reusable! When washing, gently rinse with water and dry in the shade in a well-ventilated area. ✡ This product is not a medical device.