New dynamic contouring and compression resistant closed cell EVA * Removable microfiber cover is machine washable * Reduces back pain * Eliminates pelvic stress points * Patented ergoseet is 15 x 15-inches and 2-inch tall; with its revolutionary new dynamic contouring and compression resistant closed cell eva * Reduce back pain; eliminates pelvic stress points with its revolutionary new dynamic contouring allowing unequalled support and weight distribution for back, hip and leg comfort * Revolutionary new technology; endorsed by international chiropractors association, independent marketing studies show 96.4% of participants rated ergoseet "extremely effective" * Waterproof material; hand-washable, dishwasher safe, removable microfiber cover is machine washable