inch paper pressboard as described herein without any damage to the surface to the panel even when the panel was covered with a layer of relatively thin heat reflective aluminum foil 37 approximately 2 mils as disclosed in the enlarged detail view of fig3 and 4 integrally formed adjacent supporting hollow core units 30 a and 30 c respectively reside in end pocket portions 34 a and 34 c and an elongated intermediate pocket 34 b disposed adjacent to and between end pockets 34 a and 34 c the elongated intermediate hollow core unit 32 b completes the lateral support for ironing pressure exerted on the cover layer 12 of the pad assembly 10 the releasable zipper unit 18 provides access for entry of the respective hollow core units 32 a 32 b and 32 c in their respective pocket portions 34 a 34 b and 34 c the adjacent pockets 34 a 34 b and 34 b 34 c are formed by transverse stitching 36 see fig4 the transverse stitching 36 provides the additional function of becoming a hinge for supporting and folding of adjacent units 30 a 30 b and 30 b 30 c the stitching 36 sewn at fold lines 22 see fig1 conveniently provides the means for folding the pad assembly 10 lengthwise to.