I am selling this item because I bought it but haven't used it. I only tried it on. Size: Free Size: Unisex ・Weight: 110g ・Color: Black ・Material: Cotton/Polyester ・Lightweight & comfortable to wear, supports poor posture and back posture! ・Shoulder pressure distribution structure reduces the burden when wearing ・Mesh material and ventilation holes ensure breathability! ・Unisex, adjustable free size ・The belt part is elastic for easier movement!