D-SHAPED DESIGN: Our Special D-shaped back cushion offers good support for your lower lumbar area. This firm cushion helps relieve your back pain from sitting or driving. You could sit much more comfortable with the D-shaped lumbar roll. PERFECT SIZE: After Hundreds of testings, we finally decide to make the shape of this into half-cylinder instead of a whole cylinder. A half-cylinder shaped cushion can placed steady on chairs and will not slip off easily compare to a whole cylinder shaped cushion. WIDE RANGE OF APPLICATIONS: Besides a normal back cushion on chairs, this pillow could also used as a neck pillow, knee pillow and on bed. It could relieve your neck effectively if you spend hours on using phones. PREMIUM MATERIAL: Make of high density memory foam which offers best support experience. Breathable and removable cover for easy cleaning, allows heat to spread quickly, keep it cool and dry all day. colour: black Material: chemical fiber+memory foam cotton size: 28x15x10cm Package Contents: 1*Back Support Pillow Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.