Yosoo Knee Pillow Cotton Cover Knee Ease Pillow Cushion Aid Back Leg Pain Support Sponge filling Sponge filling and pure cotton cloth cover. Mulit- funtion pillow which can help soothe lower back pain or arthritic joints. The pillow gently straps in place and moulds to your shape. Knee pillow help you ease lower back pain or arthritic joints with this pillow. It fits for when you lie on the side clamp knee, ankle pads, wrist pads, prone head pad and so on.