of hooking mushrooms the hooking elements 12 generally make contact with the base of the recess 28 on the front or button side the free side edge areas 21 of the cover strip 20 as is apparent from fig1 are folded over themselves in the direction to the front side featuring the hooking elements 12 i e toward the side facing the seating pipe 24 the fold lines 29 each extend in the longitudinal direction of the cover strip 10 in the illustrated embodiment fold lines 29 are flush with the side walls 35 of the seating pipe 24 in the hook and loop connector piece pressed against the seating pipe 24 as is shown in fig1 the cover strip 20 rests on the wall parts 22 which laterally delimit the mold trough or recess 28 with a double material layer this double layer of the folded cover strip 20 acts like a sealing lip preventing penetration of foam material into the recess 28 in the foaming process i e when the foaming mold is filled with foam material this sealing is additionally promoted by the nonwoven like configuration so that the hooking elements 12 of the support strip 10 held in the recess 28 are protected against the danger of being cemented by the penetrating foam material and consequently becoming unusable along the wall parts 22 of the seating.