Size: L 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 　　　　　　 　　　　　　　　　　　　　　　 [The Secret to Correction Power, Never Slouch Again!!] We specially invited Mr. Hiroki Shimazaki, a Japanese physical therapist, as our advisor, and meticulously developed this "metal bone" back support based on human engineering principles. When you wear it, you'll instantly feel a comfortable sensation as if your back is being pulled up. It provides stable support even with prolonged wear, unconsciously maintaining your posture at all times, so you won't easily collapse. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 　　　　　　 　　　　　　　　　　　　　　　 [Transform Your Posture with Just One Piece!! Towards Beautiful Posture~] It corrects various posture problems such as rounded shoulders and hunched shoulders, while simultaneously providing support to your back muscles. Whether you're working, doing chores, exercising, studying, or out and about, this posture belt fits snugly around your entire back, supporting the habit of correct posture unconsciously. By wearing it for just 2 hours a day, you can experience positive changes in your body in just 21 days and achieve beautiful posture. Notes: You may feel a slight discomfort when you first wear the posture supporter, but don't worry. Please shorten the wearing time appropriately and gradually get used to it. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 　　　　　　 　　　　　　　　　　　　　　　　 [Achieve Both Fabric and Support, for the Best Wearing Experience!!] Made with elastic cotton material, the shoulder straps and waist belt fit perfectly to your body, making it suitable for all body types. Additionally, the shoulder straps come with detachable underarm cushions for added comfort! The back is made of a full-coverage air mesh material, providing effective correction while ensuring breathability, so you can stay comfortable without feeling stuffy even in the summer!