Abstract: A fastening device comprising a pin affixed to a first zipper track, the pin comprising a first magnet and at least a first engaging element; a box affixed to a second zipper track, the box comprising a second magnet and comprising at least a second engaging element complementary to the first engaging element of the pin, wherein the pin and box form a single element through the releasable interaction of the first and second magnets, and the first engaging element of the pin reversibly interacting with the second engaging element of the box; and a first slider body, wherein the first slider body comprises at least one releasing element that reversibly disengages the first engaging element of the pin from the second engaging element of the box.