Snugpak’s performance figures are drawn from over forty years of experience and customer feedback. Our comfort figure assumes you will be sleeping lightly clothed (thermal base layer or PJ’s) within a tent on a good quality sleep mat, at this external temperature the majority of users should feel comfortable and get a good night’s sleep.
The low-temperature ratings are temperatures the sleeping bags have been used at by fit individuals with the minimum of discomfort.
There are many variables involved in a good night’s sleep, including climate, altitude, fitness and metabolism, if in doubt stick to the comfort figure.