EM-X and Binchotan charcoal. EM-X is a substances made from natural substances such as minerals and amino acids, which are healthy and antibacterial. Far infrared radiation emitted from Binchotan charcoal, it warms your shoulders. The boa tape type makes it easy to put on and take off and adjust the size, so it fits perfectly without slipping, and the deep neck opening wont show through outerwear. Can be used on either shoulder Recommended for after sports such as shoulder, cold or shoulder use. Breathable and comfortable cotton material with good texture. Bust about 80-110cm