The secret of healthy sitting lies in having your spine in its natural and balanced 's? shape. The wedge shape of this Pelvic Tilt cushion promotes the natural curve of the lower spine by raising the hips higher than the knees and giving the pelvis a slight forward tilt. Made from high quality foam with an attractive hard wearing cover. Size 380 x 380mm (15 x 15"). 80mm (3") high at the back, tapering to 25mm (1") at the front. Weight 675g.