{HEAD ~ This foam layer} is co extensive with the exterior surface of this sheet, and is usually attached with {TAIL ~ an adhesive} which joins the foam and the surface so no air space exists therebetween 
is usually attached with
{ HEAD ~ This foam layer } is co extensive with the exterior surface of this sheet , and is usually attached with { TAIL ~ an adhesive } which joins the foam and the surface so no air space exists therebetween
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH