Ergonomic design The leg support pillow uses a heart shaped contour that fits the curve of the leg and knee. The center hollow design allows air circulation for a refreshing rest and helps improve sleep quality. High density memory foam plus removable pillowcase Made of high quality memory foam that is dense, soft, elastic and non deforming. The pillowcase is made of breathable soft cationic fabric that will not shrink or balloon and is removable. Take out the memory foam through the zipper and wash the pillowcase by hand or machine. Note: The memory foam pillow core is not washable. Elastic band design The knee pillow features an elastic band to prevent slipping during adjustment, so you can change position in the dark without fumbling and maintain a comfortable, peaceful sleep. Sleep better Provides ideal spinal alignment and support to improve sleeping posture. It supports knees and legs, reduces joint compression, and encourages correct posture when lying on your side. You can place it on the thighs, calves, knees and even the neck. Use scenarios Use while sleeping on the side to align the spine and relieve knee and leg pressure. Use after knee or hip surgery or during pregnancy to support the legs and reduce discomfort. Use for resting or relaxing by placing on thighs, calves, knees or neck.