Office swivel chairs and car seats arent the most relaxing - especially when sitting for hours and hours on end, day in day out.But car seats often dip and sag creating stresses and tension in the small of the back, the coccyx, the middle back, upper back, shoulders and even the neck giving you constant discomfort while driving. And if you work on an office chair at a desk, just the simple action of sitting for hours is likely to cause neck and lower back pain due to the enormous pressures sitting on an office chair can place on the spine.Sitting on any old cushion or pillow on a car seat or office chair may help a little but for something of real therapeutic value to ease these tensions, relieve pressure points and eliminate numbness you need a wedge shaped cushion.