Abstract: A thumb support for preventing injury to the thumb of a user by preventing the thumb from being forcefully hyper-extended or radially abducted while permitting the user to flex or move the thumb towards the palm of the hand in a grasping or pinching motion. The support includes a thumb stabilizing component and a wrap component, and can also prevent wrist injury from hyper-extension. The thumb support typically includes a loop formed at a first end of a strap, the loop being dimensioned to accommodate a user's thumb, near the base thereof, and an elongated portion extending from the loop, of a length sufficient to diagonally follow the metacarpal of the user's thumb and wrap around the user's wrist at least one time.