This is Eric B. the Tarptent fanboy, back after a long time of misplacing my UN and PW. (Don’t even ask.)
I’m now 82 and still a confirmed gear head and YouTube backpacking channel hound. Plus I still ski my buns off at great western resorts.
SO… my question: Is the British (I think) Flextail/Zero RO5 winter mattress any good?
(I’ll ask on winter hiking too but at this time of year who would view that forum?)

