The wrist pad helps if the mouse is too large or the grip would force the holder's hand at an awkward angle.
If your palm lays flat on the desk and your wrist is at an upward angle, that'll hurt your tendons pretty fast and affect your fingers and wrist. The wrist pad doesn't help a lot though because if you move the mouse with your fingers you'll have to grip the mouse more tightly rather than just rwst your hand on it and move it around by moving your forearm.
Ideally your hand would be slightly rotated so that your pinky is closer to the desk and your thumb higher up and if you need something to elevate your hand, then the pad would be closer to your elbow so that you can use your forearm.
If your palm lays flat on the desk and your wrist is at an upward angle, that'll hurt your tendons pretty fast and affect your fingers and wrist. The wrist pad doesn't help a lot though because if you move the mouse with your fingers you'll have to grip the mouse more tightly rather than just rwst your hand on it and move it around by moving your forearm.
Ideally your hand would be slightly rotated so that your pinky is closer to the desk and your thumb higher up and if you need something to elevate your hand, then the pad would be closer to your elbow so that you can use your forearm.