This IKSTAR round cushion provides comfortable seating with breathable mesh material. It's an ergonomic, low-rebound cushion designed for comfortable seating without worrying about buttock pain. The IKSTAR cushion has a slight forward slope to reduce pressure on the thighs and improve circulation even when sitting for long periods. * The arc-shaped design on both sides effectively absorbs pressure on the buttocks, and the raised design at the rear deeply absorbs pressure on the coccyx, distributing body pressure so you won't get tired even after sitting for long periods. * Recommended for those suffering from lower back pain, poor posture, pelvic support issues, postpartum recovery, post-surgery recovery, and those who spend long hours sitting in bad posture. * Size (approx.): 3D structure = 38cm (length) x 45cm (width) x 4-11cm (thickness). The thickest part (11cm) is not the seating surface, but the thickest part at the rear, which rests against the upper buttocks when sitting, for improved fit!