An improper sitting position can lead to all sorts of discomforts. That's why we had doctors assist in the design of the Spine-Align� Wedge seat cushion. It fixes posture problems and places you in a sitting position that enhances the natural S shape of your spine. This alignment relieves back stress, improves energizing circulation, and alleviates discomfort in the hips, back and legs. For the home, car or office, this device is a smile you can take with you wherever you go. Choose the Model 20 for office chairs, Model 22 for extra thigh support most popular office chair cushion, and the Model 25 for just a wee bit of support ideal for use as a car seat cushion. These angle seat cushions are useful in relieving sciatic and leg discomfort.