NATURETY Memory Foam Waist Pillow,Support Pillow for Side Back Stomach Sleepers,Relief Back/Leg Pain (Camel) 75%cotton 25%polyester Designed to improve spine posture and help reduce strained back muscles and ligaments in the back, side, and stomach sleeping positions. Memory Foam will change hardness as temperature changes.Above 68, it becomes soft. Proper spine posture relieves strained back muscles and ligaments and relieves back pain while sleeping. Super-soft, machine washable outer velour cover. Inner mesh liner increases comfort and breath-ability. Large size24*12*3"