I don't generally use a pad, though I'm still working that out. My feet have gotten cold without a pad, and with a pad. They've gotten cold with socks, and with socks and down booties. The last few trips I've used no pad, no socks, and no booties, and my feet have been warm, even down to 18 degrees.
When I have used a pad it's just a ccf pad that I use for support in my GoLite Jam - nothing fancy, maybe 18" x 36 inches.
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