Spine Posture Corrector Color: Black, Size: L Key benefits Promotes an upright posture by applying ergonomic support to the upper back and waist, helping you maintain a straighter spine and a more aligned silhouette. Comfortable for extended wear thanks to breathable velvet fabric, a formable aluminum alloy bracket, and a removable soft chest pad for easy cleaning. Lightweight and low profile so it can be worn under clothing without restricting normal shoulder and arm movement. Features Ergonomic design: humanized backpack style fits the back and encourages a straight spine while allowing normal chest and abdominal breathing. Adjustable fit: easytoadjust straps let you set the right level of support and comfort. Materials: breathable velvet fabric for comfort; aluminum alloy bracket for stable shape and support; removable soft chest pad for added comfort and simple cleaning. Invisible under clothing: slim profile works discreetly under shirts. Size guide Size S: height 55 to 63 inches (140 to 160 cm), waist 25 to 31 inches (63 to 79 cm) Size M: height 63 to 69 inches (160 to 175 cm), waist 31 to 39 inches (80 to 100 cm) Size L: height 69 inches and above (over 175 cm), waist 39 to 43 inches (100 to 110 cm) How to use Put on like a backpack and adjust the shoulder straps until the back panel rests comfortably and the chest pad sits gently. Tighten or loosen straps for a supportive but nonrestrictive fit. Remove the chest pad when cleaning. Practical use scenarios Office and remote work: wear during long periods of sitting to encourage better posture at your desk. Study and reading: use while studying or reading to help maintain a straight back and reduce slouching. Commuting and light activity: suitable for wearing during commutes or light walks when you want discreet posture support. Suitable for People looking for daily posture support and improved back alignment during routine activities. Color: Black. Size: L.