The 8 degree wedge with coccyx cut out angles your body and relieves pressure as you sit to encourage better posture and prevent back pain. The cut out section means that no pressure is put on your lower spine. This helps you sit more comfortably if you have had an injury to that region. The memory foam is highly comfortable. We found this particularly useful in the car as it helps achieve a higher driving position. If you find it difficult to sit up in a car seat because of sagging, unsupportive upholstery this wedge shaped cushion solves that problem simply and economically. This would be similarly useful if your favourite chair is beginning to sag a little.