I have a bunch of down bags and the difference between a badger and a 20* sea to summit is that my badger WILL keep me as a cold sleeper warm at 15* in just my normal sleepwear and my sea to summit will be chilly at 30* in the same clothes.
It takes a -20 bag from the typical commercial company to hang with the badger.
It takes a -20 bag from the typical commercial company to hang with the badger.