Most designers engineer mummy bags for cold conditions, but such a tailored cut and lots of lofty insulation can come at the cost of breathability. On average, down is more breathable than synthetic fill materials. So, if you’re a warm sleeper, or will be camping in conditions that hover around the top of a sleeping bag’s temperature range, you might consider a bag filled with down insulation.
This article was originally published by Fieldandstream.com. Read the original article here.