Abstract: The backing for the mop has oppositely facing pockets at each end, one of which is much shorter than the other and has a cross member overlying the open inner end thereof. The cross member is secured to the backing along opposite edges thereof and is open at both ends thus permitting one end of a slip-through frame to be inserted through the cross member from the outer end thereof and into the larger pocket at the other end of the backing. The other end of the frame is then inserted into the shorter pocket by pulling the shorter pocket back from underneath the cross member and over the other end of the frame. The innermost ends of the cross member and larger pocket are spaced apart a sufficient distance to permit the folded ends of a breakdown frame to be inserted therein.