It can help you relieve some back discomfort. In addition, it is large enough to as a comfortable tailbone pillow, but still small enough to be portable. U-shaped cushion, the design of this office chair cushion can help prevent back and coccyx discomfort and troubles by evenly decompressing. Support the tailbone and reduce stress-The ergonomically designed seat cushion provides maximum support and comfort, while reducing coccyx/coccyx pressure and promoting a healthy posture. The non- seat, the non- bottom helps to hold it in place, so you 't slide around when trying to stay seated. Most importantly, the lid is removable and machine washable. The seat cushion is made of memory foam; the surface is made of breathable football cloth; the side is made of breathable large mesh. Use slow rebound technology to provide good support. The hollow the middle speeds up air circulation. The chair pillow can ventilation when sitting down, providing you with a and comfortable experience. Provides relief of lower back pain and sciatica, very suitable for office use, driving and travel-Supports recovery from lower back problems, intervertebral disc herniation, coccyx injury, sciatica and other spinal problems. It is very suitable for office, family, travel, car seat or wheelchair use. Type name: Memory foam cushion Weight: about 550 g Style: modern and simple Colour: coffee color Material: memory foam Size: 45x35x7 cm Package Contents: 1 x Memory foam cushion Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.