2 Pack Half Moon Bolster Pillow for Legs, Knees, Lower Back.Semi Roll Round Pillow for Ankle and Foot Comfort, Head Neck Spine Hip Pain Relief,Machine Washable Cover 【 High-Quality Supportive Form Core】 Made from CertiPUR-US certified, premium foam that maintains its form.Before use, it is necessary to air the pillow out for 24 hours. The leg pillow for side sleeping may have a slight smell because of the freshly manufactured foam and vacuum packaging.It is not memory foam and not suitable for use on the neck. 【Ergonomic Design】The design curve of the half-moon pillow perfectly fitting your body curves.Its unique design can effectively best comfort & support your body needs,elevating your feet,lower back,knees,buttocks,and legs to help relieve pain.Adjustable positioning prevents joint strain and muscle stiffness. 【Personalized Comfort】It measures 20.5" x 8" x 4.5" ,fitting most people.It relieves pain for those who sleep on their stomach,back,or side,and also serves as an ideal knee pillow for back sleepers.It may not perfectly fit all body types or meet all comfort preferences,It is hoped that you can give the pillow an adaptation period to experience its supporting effect. 【Applicable People & Muti-Purpose】The knee pillow for back sleeping adapts to various scenarios; use as a pregnancy side-sleep pillow,office lumbar support,the leg pillow is suitable for yoga enthusiasts and recovery patients. 【Removable Cover】The soft breathable cover prevents too much heat from becoming trapped close to the skin.Its cover is removable and washable,its insert is not washable.