E-Z UP Instant Shelters Deluxe Weight Bags - Set of 4 Canopy Weight Bags Corrects posture over time for higher energy levels, more confidence, and prevention and alleviation of chronic back pain Lightweight and discreet, our Posture Brace pulls the shoulders back and straightens the spine to instantly improve your posture It's easy to adjust for a perfect custom fit and its cushioned 'soft-feel' spine makes it comfortable for everyday use Modeled after the Figure 8 brace with its backpack like design and focus on pulling the shoulder muscles back for immobilization Start wearing in 30 minutes increments, gradually increasing up to 3 hours. Wear during little to mild physical activity.