Material: punching sponge, nylon webbingSize:XS: suitable bust 50-70cmS: suitable bust 70-85cmM: suitable bust 85-105cmL: suitable bust 95-125cm10cm=100mm=3.94inchFunction: Used for shoulder recovery, correct posture for humpback crowd, prevent humpback, show a straight, confident posture 1SHOULDER STRAP CORRECTURE BACK HOLDER: Pain your shoulders or have problems in the lower and upper back? Do you have neck and back pain because you sit a lot? Posture Correction is a preventive back correction solution and relieves back, lumbar and neck umconfort. In addition, an upright posture and a straight back and neck support are good for the spine and improve well-being. 2ANTI-ALLERGIC QUALITY MATERIALS: Our back strap with spine support is made from breathable, durable and lightweight materials. Posture correction men's back made of thick neoprene with holes and elastic edges for comfortable breathing and comfort, even under your clothes and fitness clothing. The rear part of the corrector has been widened in a new design and reinforced with semi leather - a real back stabiliser with shoulder support. 3ADJUSTABLE CORSED BACK SUPPORT BELT: For easy handling, this back straight holder is adjustable at the front. The back belt is suitable for women, men and children with wide or narrow shoulders. Wide straps to prevent friction on arms or armpits and prevent skin irritation. Adjustable hook and loop fastener strap to ensure a long life and adjust the corrector to the body even during sports and fitness. 4LIGHTWEIGHT: Reinforced fabric. Correction bandhas chosen a straightforward holder for an upright posture for lightweight and durable attachment loops that facilitate the connection between the straps to support and the back of the posture corrector. 5DURABLE: The buckles are fastened to the back holder with a reinforced tear-resistant fabric with an X-shaped seam which prevents the fabric from twisting when adjusting the back support.