This pillow was created with side sleepers in mind (approximately 47% of the population); it creates the proper posture while side sleeping by elevating the upper knee and allowing for a more comfortable night’s sleep. This pillow helps ease back, leg, knee, ankle, and hip joint pain by providing proper spinal alignment and reducing pressure while you sleep. Also, perfect as a knee spacer during pregnancy or post-surgery recovery (hip replacements). Our pillow is constructed out of sturdy urethane foam with a 1” gel-infused memory foam outer layer on the sides which helps keep you cool while molding the pillow to your exact shape. We’ve topped it off with a machine-washable, breathable knit cover.