Improves circulation and helps to maintain pelvic position. Fits comfortably under the back of the knees. Designed to create a 30 degree bend in the knees. High density foam maintains shape. Navy Blue removable, polyester/cotton washable cover. We love the Knee Elevator Wedge because your knees resting on the perfect bend make the rest of your body feel so much better. Of course the Knee Elevator Wedge is ideal in recovery, but also great for everyday use to rest and relax in good alignment and horizontal posture.