This double-grooved memory foam leg support pillow is made of high quality 45D memory foam and includes a polyester knit cover making it soft and comfortable to the touch. The firm memory foam construction provides fast-acting relief for a wide range of different aches and pains, allowing you to wake up feeling rested, rejuvenated, and energized for the day ahead. It helps ease back, leg, knee, ankle and hip joint pain by providing proper spinal alignment and reducing pressure while sleeping. Just insert the bolster between your knees and sleep on the side most comfortable for you. In addition, the cover of this pillow is designed with zipper making it is easy to remove and clean. It is also anti-bacterial and anti-dustmite.