ZJZ Knee Pillow for Side Pillow, Memory Foam Knee Pillow, Suitable for Relieving Leg, Back, Knee Pain, improving Sleep Quality, Butterfly Side Pillow Leg Pillow1. High Quality Material Knee Pillow Inner core is made of 100% high quality memory foam foam. In use for a long time to maintain comfort and will not be deformed, made of pure environmentally friendly materials, no smell! 2. Breathable Easy Clean Cover The memory foam pillow comes with a removable and breathable zipper cover that ensures the pillow doesn't heat up, doesn't get dirty easily, is friendly to your skin, easy to clean, and machine