material: 45% polyester 35% rubber 20% silicone Color: black, white, red, blue, fluorescent green size: one size Features: perspiration, quick-drying, breathable Length: about 50cm in circumference, about 2cm in width This product is made of 45% polyester, 35% rubber, and 20% silicone. The inner strips also have silicone anti-skid strips to prevent them from falling out during exercise.