Abstract: A unique system has a releasably locking device for quickly and easily locking and releasing a loop-section fastener on and from a loop without the needs for taking the loop apart, respectively. The unique system comprises a plurality of opposite loop receivers of a footwear, a tongue of the footwear, a loop, a loop-section fastener, and a releasably locking device. The footwear has two opposite sides, on which the opposite loop receivers are disposed, respectively. The tongue has at least one opening and outer and inner surfaces. Each of the at least one openings extends from the outer surface to the inner surface. The loop has a plurality of loop sections. The footwear is laced with the loop, such that each of the loop sections extends between two of the loop-receivers on the same side, and such that the loop is threaded through the at least one opening of the tongue.