The Stay In Place Knee Pillow - This is the knee pillow with a unique C shape that wraps comfortably around the leg to stay in place all night. Without constrictive straps that can impede circulation or irritate the skin, this pillow simply hooks around the thigh like a soft cuff, allowing the leg to breathe without slipping out of position.
@Overstock - Carex Blue Knee Pillow - The Carex Knee Pillow is ergonomically designed to provide ideal spinal alignment to help reduce lower back, leg, hip, ankle or joint pain. http://www.overstock.com/Health-Beauty/Carex-Blue-Knee-Pillow/5610088/product.html?CID=214117 $24.49
first reviewer much preferred this over the blue one Knee Pillow For Sleeping, Back Pain Relief, Side Sleepers, Sciatica Pain | Designed by Doctors for Professional Settings | KNEE T | Best Side Sleeper Pillow - Made in USA |Medical Grade | 10 Yr Warranty | Hypoallergenic Certified HR Foam| Knee-T http://www.amazon.com/dp/B009U1Q3UG/ref=cm_sw_r_pi_dp_JvK0ub1CAXJFP
In-Between-The-Knee Pillow Polyurethane Foam. Brand New! Helps relieve pain and pressure on your lower back hips and knees. Cover machine washable. Size: 10 x x Contoured leg pillow made from high quality polyurethane foam.