Avoids forearm twisting for comfort and good health the patented shape supports your hand in an upright neutral posture that generally avoids forearm twisting many users including medical doctors ergonomists and physical therapists said the evoluent verticalmouse provides superior comfort and even relieved their wrist pain comfortable and easy to use the shape is thoughtfully sculpted for uncompromised comfort and easy to reach programmable buttons no finger contortions are needed to ope