Originally Posted by
Cyclebum
Aren't you gonna have at least one set of winter clothing for this trip? Forget the liner and just sleep in them if it gets too cold.
A liner can be useful, but layering is definitely the way to extend the temperature range. I tour with a 3-season quilt and have a combo of clothing layers that will keep me warm on the bike down to freezing so the combination of the two is good to well below freezing. My layers for sleeping in extreme cold are
3 season quilt
merino wool hat
Marmot driclime windshirt
merino wool long sleeve T shirt
cycling knickers
merino wool long underwear
socks