Would you have the 240 to compare for size? It sounds like you are my exact size at 5'11 205lbs. I do run a 44.5" chest. I have a 240 in Large and it fits absolutely perfect, and my Kutana Hybrid is XL and i feel as a mid layer it should be slightly tighter. Everything in Sitka i own is Large so i'm debating on a Heavyweight Hoody or this 280 right now for a mid pieceI'd give the Sitka HW a slight nod in warmth, but the SF gets a nod in durability.