OBU1075 Features: * Backrest support * Shifts spine into positive neutral curve removing pressure from the lumbar discs * Moves should blades upward reducing slouching and even improving respiratory capacity * Scientifically proven to relieve back pain * Tested at Stanford University, UCLA, and the Mets Clinic * Made in USA Dimensions: * Small: 27.5""H x 15""W x 4.17""D * Medium: 29""H x 15""W x 4.5""D * Large: 30.5""H x 15""W x 4.9""D Warranty: * Complete medical provides lifetime for frame and other parts 1 yr limited warranty