COMFORTABLE MEMORY FOAM KNEE PILLOW works great to support knees, legs, and hip. The leg strap holds the pillow in place so you can turn at night without having to reposition it. Recommended for pregnant, after hip surgery, for athletes, and anyone who suffers from back pain. The soft outer cover has an invisible zipper. Remove the cover to machine wash. Orthopedic Doctor Recommended helping relax leg, back, muscles and tendons. A perfect sciatica pillow for sleeping, hip pillow for sleeping for people who have had hip surgery, and between the knees sleeping pillow for legs.