I just used a sheet of "foamed pvc" that I ordered through a local sign company. I checked home depot first, but none within a 2 hour drive, so went with the more expensive stuff from the sign store. I would guess it's very similar to the product posted here.
Think of it like this, if you cut a piece of PVC pipe, you see solid plastic. No air pockets whatsoever. Just solid plastic. This pvc sheeting isn't solid like that. For some reason, I expected it would be, but it isn't. Instead, if you were to cut a piece of 1" foam board insulation, you'd see some very tiny air pockets, make it "foam board". This pvc sheeting is very much like that. I'd say this adds to the insulation factor and does make it lighter. I cut mine with a circular saw using a 40T finishing blade, and it cut very nice. made a lot of dust, but did a great job and no melting. The edges weren't as smooth as the sheeted side, but I did not feel the need to have to sand or fill them with anything. Still fairly soft to the hands.
Don't know if that helps anyone or not.... but figured I'd mention it.
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