The Knee Rest is a positioning wedged designed to be placed under the knees for pelvis traction, to improve circulation, or to relieve swelling in the knees or ankles or from phlebitis. The wedge also relieves stress on the lower back. The foam wedge includes a polycotton cover. OPTIONS: Replacement covers are available. DIMENSIONS: 24 x 11 x 19 inches. COLOR: The cover is available in blue or white.