dave macrae
Senior Member
I have not used in the snow, going out a week from tommorow and suspect it will be cold enough to get good idea , The first time I used it was in june and it was around freezing @ night and was way too warm in a down -9 C bag that i would have been pleasantly cozy in with my old mat so I think the claims on the R value are reasonably clsoe to reality. the packed size and weight is really nice and is much more comfortable as well .