Not sure how cold I can take the MW3 down to. Morning of the coldest night (no thermometer) had a heavy layer of frost on the ground and bit on my gear. Toasty warm sleeping in base-ware using the Nest as a tq. Convinced me to sell the MW4. Not a winter camper. Not bad for a ~22oz full length uq. The convertible MW3 should be considered an option to "compete" with the lighter 2/3 - 3/4 uq noted above.
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