ORTHOPEDIC SURGEON DESIGNED to ensure the precise angles and dimensions for proper in-home rehab SIMPLIFY YOUR REHAB and increase the stability of your knee during the critical days after surgery. Never rehab with unstable bed pillows again! PREVENTS EXTERNAL ROTATION of the foot, which helps keep knee straight and not bent. LIGHTWEIGHT & DURABLE for easy transport and use in home, bed, or travel. Universal use for right or left extremities. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.