Material: Leather high crystal reflective strip Appearance: The surface is clean and flat, without stains, wrinkles, damage, open lines, missing needles, thread ends and other defects. The wiring is regular, without defects such as jumpers, breaks, and thread ends. Comfort: Comfortable to wear, does not affect joint flexibility, and has no sense of compression. Structural connection strength: Nylon bonding strength is not less than 7.0N/c ㎡