"I am in love! The Cirque HotTub is rated to 0 and I have used it in
yellowstone at -5 and was still warm (I normaly sleep cold ) !! The
HotTub also has two zippers one on each side so you can reach
out to read or do thing with your hands from snug inside the bag. it
is filled with fluffy 750 fill down and weighs 3lbs 10 oz and has
plenty of room to get comfy. the lining is some kind of vapor
control stuff that feels like flanal If you are looking for a warm bag
this is it. Sleep well!"