Obusforme Contoured Seat Cushion BlackUnique design evenly distributes body weight and encourages proper alignment of the pelvis and thighs for extended comfort Cushions your tailbone. jpg, sitting bones. jpg, and thighs to help alleviate pressure points Removable front section is easily unzipped to allow for use with narrow chairs and benches Can be used with any ObusForme Backrest Support to create a complete and comfortable sitting experience Lightweight and portable for use in home.