HeatPak Dual Overlay is used on top of Warmup Foil Heater. 2.88 SQM one pack 4 pairs Heat-Pak is composed from high quality MDF with a low tog rating (0.7 togs). The 3 mm baseboards and 4mm topboards are coated with a special interactive contact adhesive to give a strong, permanent fullsurface bond. Check out my other listings for complete System Foil Heater and underlay. OTT
