Support plastic plate: Ergonomic design that follows the movement of the back. The plastic plate can bend 360 degrees to relax muscles to a certain degree, protect the spine, and help correct bad spine habits. Applicable people: suitable for children and adults; unisex. Specifications: ergonomic design with a better fit on the back; helps prevent and relieve back pain; opens the shoulders to straighten the back; stretches and expands the chest; improves hunchback and helps prevent slouching. Material: Velcro design; with elastic polyester interlayer and polyethylene interlayer. Use scenarios: At a desk or study area for adults and children to promote upright posture during long work, study, or screen time. During daily activities such as reading, driving, or screen use to prevent slouching and reduce back strain. During light exercises or warmup to stretch the chest and support back straightening.