[Premium Memory Foam Seat Cushion] The memory foam donut cushion core is made of high-density, slow-rebound memory foam for strong support. It will not deform even after long-term use. The memory foam has a thermal sensing function that senses body temperature to adapt to the body curve and provide optimal comfort. <br> [Ergonomic Design] The contoured area of the hip pillow provides effective support for the hips and thighs. The hollow design in the center of the coccyx cushion relieves hemorrhoids and postoperative pain. The ergonomic U-shaped groove design relieves the pressure on the coccyx from sitting for a long time. <br> [Washable Velvet Pillowcase] The surface of the pillowcase is made of soft velvet and is equipped with non-slip silicone on the bottom. The smooth zipper allows you to remove the pillowcase for washing at any time. However, please be careful not to leave the coccyx cushion on the surface of light-colored leather materials for a long time to prevent accidental staining. <br> [Ideal Cushion] This office chair cushion is suitable for any type of chair and can make any uncomfortable seat comfortable and relaxing. It is perfect for use with family and friends on special occasions such as birthdays, Christmas and Mother's Day. <br> [Please Note] For more effective and comfortable support, we recommend that the support weight of the sciatica relief pillow should not exceed 180 pounds. The bottom of the cushion is non-slip silicone, so please do not place the cushion on the surface of light-colored leather materials for a long time to avoid the cushion staining the surface of the sofa and seat. <br>