Abstract: The present disclosure relates to a footwear such as a sandal which is replaceable of an instep belt in color, material, etc., and an inner sole and an outer sole in color. An outer sole of the sandal has a first hook-and-loop fastener joined onto an upper surface, and an inner sole has a second fastener joined onto a lower surface. An instep belt has third and fourth fasteners respectively joined onto left and right parts in a front surface, and has fifth and sixth fasteners respectively joined onto a back surface. The instep belt is detachably joined to the inner sole, through the fifth and second fasteners, and the sixth and second fasteners. The instep belt and the inner sole are detachably attached to the outer sole, through the third and first fasteners the fourth and first fasteners, and the second and first fasteners.