The reason is that the unique and patented shape of the handshoemouse fully supports your hand in the best relaxed position and prevents gripping and pinching what you do when you use a standard mouse the handshoemouse was developed with all complaints in mind support of your hand and fingers prevents gripping and pinching and your arm is supported at the ideal angle of 25 30 degrees which makes sure your forearm is completely relaxed instead of over using your hand and wrist your arm