Features: Comfortable & Breathable Design : polyester fiber for all day comfort and breathability. The soft support pad gently rests between shoulder blade, using natural gravities to relax shoulders and improve postures during back sleeping. Precise Back Support : Scientifically designed structure effectively corrects poor sleeping postures and alleviates back pain. for desk workers and those seeking better sleep quality with full body support. Adjustable Fit systems : Features unique customizable shoulder straps for tightness without tools. for various body type to ensures optimal positioning and comfort. postures Improvement Aid : Guides shoulders into natural alignment, especially beneficial for rounded shoulders or forward leaning postures. Gently trains your body to maintain healthier postures habits day and night. Nighttime postures Correction : Specifically for sleep use to reinforce proper spinal alignment without disrupting rest. Works passively during sleep to cultivate better postures while you recover. Specifications: Materials: Polyester Fiber Size: as picture show Color: Purplee Regular, Purplee Extended, Purplee Pluss Extended, Black Regular, Black Extended(optional) Package Includes: 1PC Back Sleeping postures Correction Belt note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.