So I bought the Cerium LT for AK. When I put it on and messed with it, the jacket felt a little too light on the insulation for me. I returned it and got the Arc’teryx Thorium AR. I’ve been happy with it. I’ve had it down to 8 degrees recently with no problems. I wear it around town, and it will pack down to a little bigger than a softball. I were to wear the Cerium LT while being active I would probably over heat and sweat, which could effect the down, something to consider. I also have a arc’teryx atom ar (synthetic down) I use if I’m going to be real active. I used it hiking recently in high winds and cold temps (in the 20s) and I stayed very warm. Hope that helps.
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