this Product Is A Posture Corrector, Made Of Pu Leather, Nylon, And Sponge Material, High-quality And Durable. It Can Effectively Improve Sitting Posture, Hunchback, Prevent Lumbar Strain And Spinal Injury. A Good Helper For You To Improve Your Sitting Posture. features S Suitable weight: 40-80 kg M Suitable weight: 80-120 kg L Suitable weight: 120-180 kg XL suitable weight: 180-220 kg Color: Black. Material: Pu Leather, Nylon, Velvet, Sponge. Made Of High-quality Pu Leather, Nylon, And Sponge Material, Durable And Practical For Long-lasting Use. A Practical And Versatile Posture Corrector Both For Children And Adults Use. Ergonomic Design, Fits The Curve Of The Human Body When Worn, Comfortable And Does Not Hurt The Shoulders And Back. It Is Used For Spine Correction, Chest Extension, Improvement Of Kyphosis, And Prevention Of Rickets. Invisible, You Can Use It Anytime And Anywhere, Suitable For Indoor And Outdoor Use. packing List:1 X Posture Corrector