Durable material of posture trainer: Our straight back is made of high-quality abrasion-resistant stitching, washable and soft to the touch. There are ventilation holes on the shoulders. You can stay breathable and comfortable anytime, anywhere, even while It can help you correct your posture without stress. .Posture correction size adjustable: Our back brace is equipped with super long high quality velcro straps, the size is adjustable and easy to put on and take off without help. Suitable for different body types, men and women, old and young, fat and thin (suitable for L-Onesize, height 168-175, weight 115-135 kg), easily adapts to most people's needs. .Shoulder Strap Posture Correction: Our posture corrector can stretch the shoulders and is a kind of back support. It can improve the hunchback caused by poor posture and tilt the neck forward. Keep your shoulders and spine straight in your daily life. You can work and study anytime, anywhere with a more confident attitude. .Back straight holders relieve sore muscles: If you often have neck, shoulder and back pain when you work or study, you can try our back strap. Proper posture adjustment and shoulder extension can reduce pressure on important parts. Relieve your back and neck. There is also collarbone pain. .Back straightener quality service: If you have any questions, please feel free to contact us, we will reply you within 24 hours.