of the complete closure device of the invention elements 1 and 2 in the drawing correspond to elements 1 and 2 of fig1 being respectively a large central section which has been hot stretched and cooled while in stretched position and relatively small unstretched sections which are integral with stretched section 1 layers 3 4 5 and 6 which overlay the unstretched sections 2 are respectively a layer of a non silicone adhesive a non porous non adhesive layer a silicone adhesive layer and an adherent cover layer these several layers overlay the upper surface of the righthand unstretched section 2 and the lower surface of the left hand unstretched section 2 the use of the non porous non adhesive layer is optional it may be omitted and the silicone adhesive layer may be laid down on the surface of the non silicone adhesive layer fig3 of the drawings is an enlarged view of the multi layer arrangement shown in respect to the righthand unstretched section 2 of fig2 non silicone adhesive layer 3 is a thin layer of strongly adhesive material such as a lower alkyl cyanoacrylate adhesive such as the adhesive available commercially under the tradename loctite 414 an epoxy adhesive or a neoprene adhesive layer 4 is optional but when used is a non porous substrate material which may be glasscloth or a relatively inert strong plastic film such as a polyimide film suitable polyimide films are sold.