In reply to shibz: I'd rather take exercise in the Atom LT (it breathes through the side panels) but the Prism is more raggable (ie cheap and less "precious").
Both are excellent. But is the new Rab Strata better than either?
It splits the diff on price and is widely acclaimed as breathing better than the Atom LT allowing it to function across a wider usable range. I'm hoping it's a garment you can thrutch up a chimney at Stanage without over-cooking, then laugh in the face of a gale on the belay as your second follows up.
In reply to shibz:
I have both. I picked up the atom for full price and got the prism for £40.
I'll be getting another atom lt when the time comes. Not to say the prism is bad but the atom is lighter, warmer and more breathable.
The prism has the better hood though and a two way zip.
I'm 5'10" and 12 and a half stone. The atom fits me better, the prism comes up too short in the arms and waist. Both are medium.
The better sizing could account for the better warmth so you may need to try them both on.
Definitely true about the prism being less precious but the atom is surprisingly tough too.
Got both; Prism in L and Atom in M. I tend to use the Prism much more, although that's because I carry it as a lightweight belay jacket during the winter. Atom is a much better fit under a shell, as a replacement for a 200 weight fleece layer. I've also used it in winter with a windproof over the top when it's been windy, but not wet.
Both great bits of kit that get used a lot, and I doubt you'd be disappointed with either.