The pad is extremely fragile for sure. Still, I used my 1st one for quite a few years before someone talked me into selling the entire HHSS at a bargain price. I quickly poked a few holes in it when learning how to use it. This was easily patched by approximating the edges and adding a little seam sealer. I never could tell any performance loss, even on the holes that I didn't bother to repair, I would just push the edges together once things were all set up and it seemed to stay that way for the night. Looked bad, felt(worked) good when it was cold. Then I figured out how to move it around with the fkat of my hand or always keeping the undercover and/or space blanket between my fingers and the pad and I never got any more holes. I have a couple of newer pads for a couple of years now and have never torn them or poked holes in them. If I do, experience shows me no need to worry about it.
You ask: "could I even supplement the foam pad with other insulation to increase warmth?". There you have stumbled onto a tie for the biggest advantage to the HHSS, super easy supplementation, designed for that from the get go. (the other big advantage for me is built in wind and water protection from the UC) But just stuff whatever you are not going to sleep in between the UC and pad/space blanket. Stuff a fleece jacket for a significant boost. Stuff a vest or parka for a huge boost. Stuff a summer weight sleeping bag to be plenty warm at minus 27F like kwpapke did. Oh, if you should decide to go this route( UQs and PeaPods are great also at least for side zip), BE SURE to ask for the kidney/torso pad option if available. For a few $ and ~ 3 oz, this is a very big boost. Last year I set my PB with the standard HHSS, the added kidney/torso pads, the OC(but no tarp), a 21 oz Golite TQ plus hood and VB clothing: toasty and bone dry at 6F. All that was under me was the standard pad/space blanket and kidney torso pads, so it can be done ( oh yes: I added a short WM blue pad under my legs only to help fight calf pressure). But I suspect the VB clothing helped a lot also. Still, that is not much under me to be toasty at 6F, probably could have gone below zero. Maybe about 23-24 oz for full length and including a wind/water proof UQP(under quilt protector equiv aka HH under cover)?
Then again, I could tell you great success stories about a JRB MW4 and Speer Pea Pod also, but a few more $, especially if you add an UQP. Good stuff though!
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