I have a U.L. Thermawrap from several years ago… not sure how it's changed recently. My Thermawrap is definitely lighter and believe it or not, seems a bit warmer than the ArcTeryx Atom LT, partially due to the fleece side panels, but it seems more than that. On the other hand, the Atom fits perfectly, moves with me, and looks nicer. Backpacking, the Thermawrap is my go to jacket. Around town, skiing, climbing (if I was still doing it) I would go with the Atom. Of course, from a warmth perspective, the Montbell UL Down Jacket crushes both and is lighter.