When I first started hanging back in 2004, I used reflectix and a CCF wally world pad in my Big Agnes Horsethief and HH Exped. Good down to around 45 with no problems. Lower than that, you'd need a SPE to keep the cold shoulder away. I still carry a small piece for a sit pad and stick it in my top quilt on cold nights. I have part of that original roll in my attic, it never goes bad.
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