I'll just add to PG's great comments: Anything you choose to wear needs to be loose, particularly socks (as he pointed out.) You don't want to wear anything that might constrict and impede circulation.
I'll just add to PG's great comments: Anything you choose to wear needs to be loose, particularly socks (as he pointed out.) You don't want to wear anything that might constrict and impede circulation.
I've used my Gemini underquilt in 2-layer mode down to 22 degrees. It's probably close to a 40 degree quilt in performance. Full system included my intermediate bag (probably equivalent you a commercial 10 degree bag)
and bivy cover from a USGI MSS, poncho liner in my bag, and with 2 layers of clothing and footwear. This is a complete system that I've put together over a period of time as I pushed down from 60 degrees to the 20s.
I think with the right clothing and "extras" you could make it work, but I would work towards it gradually and in a "safe" environment as others have suggested.
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