WINDAY OT-4P Therapy Four Position Support Pillow with/Removable Cover Ergonomically designed semi-roll pillow; Therapeutic sleep posture to reduce head, neck, shoulder and back discomfort Can be used as a knee support pillow, lumbar support pillow, or leg spacer Memory Foam is Antimicrobial and Resistant to Dust Mites Machine washable plush velour cover Standard Size: 19 x 7 x 4 inches Do not be fooled by the price. We only use the best materials we can find anywhere. We do not have to pay for retail space, sales people or expensive advertising. Also, Amazon saves both of us a lot on shipping. We pass these savings on to YOU!