The Knee rest pillow’s soft foam is more stable than regular pillows. The Knee Rest Pillow is designed to promote proper alignment, reduce pressure or elevate extremities. Knee rest pillow’s can be placed under knees, arms, feet, or behind back. Knee Rest Pillow Features: Designed to promote proper alignment, reduce pressure or elevate extremities. Cotton cover is machine washable. Knee Rest Pillow Specifications: Measures 24 x 11 x 15 inches. Non returnable if packaging is opened.