Quote Originally Posted by Derby Tup View Post
I got very cold and shivery a few weeks ago in Wasdale. We'd jog / walked over from Honister to help with a BG and conditions were good, but I hadn't really got a warm enough layer to put on while we were waiting for the contender. I ended up warming up in a car, with tea and a sleeping bag over my legs. A Primaloft jacket would have been a big help (I was carrying full Gore-tex cover, but there's no real warmth in them)
Yes for it's weight Primaloft is a very good way to trap heat. Shells don't do that very efficiently, especially after sweating then cooling down due to the cooling effect of sweat. I may in the future try using 2 waterproof layers, 1 layer to start off with, and 1 to put over that for if I slow or the conditions worsen, I think that could provide a, lightish to carry, heat trap.