Instant Relief From: Hemorrhoids, hip bursitis, broken tailbone, herniated discs, bed sores, anal fissures, ischial tuberosity, fractured coccyx, pressure related to childbirth, vaginal surgery, and sitting for long periods of time that can cause lower back, hip, leg pain Cushion with an ergonomic ?O? shaped cutout, this butt pillow conforms to lower body contours providing natural support with little to no pressure on your most sensitive areas Cushion may feel firm initially, but being heat sensitive, it will soften once it absorbs body heat. The sciatica pain relief pillow has a non-skid backing that prevents slippage. Fits Most Chairs and Seats: This sitting donut pillow fits most office chairs, inflight seat, gaming chairs, desk chairs, computer chairs, standard dining chairs, car driver seats, couches, wheelchairs, and recliners. Dimensions - 35 x 45 x 8-4 cm