High-Quality Memory Foam/BlissTrends knee pillow is made of high-density memory foam to provide strong support for aching body parts. The material is soft and elastic, with excellent support, creating a more comfortable sleeping environment for users Ergonomic Design. Ergonomic design - the size of the knee pillow is 10'' X 7.9'' X 5.7'', in the process of use can be a perfect fit for the body parts, will not move easily, so that your spine and hips can maintain the correct posture, effectively avoid collision of the knee, and reduce the pressure on the body, comfortable and firm Removable Washable Cover. The cover is made of high-quality fabrics, which will not irritate the skin. The zipper is easy to operate, will not jam or tear easily, and is also very convenient to remove at any time for washing. Strap is not included. I use it because this knee cushion is doctor-recommended