Rainmanjpwrote a review of Rab Microlight Down Jacket - Men's on January 17, 2017
Familiarity: I've used it several times
Fit: Runs small
I ordered this and an Arc'terx Cerum LT for comparison
I preferred the fit of the RAB and the inclusion of a chest pocket. I'm 5'11'' 175lbs size 42 suit , 15.5x33 dress shirt and 33" waist. The Large fit me perfectly as a baselayer and I'm able to use my Marmot Shield as a 2nd waterproof , windproof layer if I need to. I preferred the fit of the RAB to the Arc'terx and I preferred the 30D pertex fabric used on the RAB.
Lastly the combination of blue with the red zipper is fantastic.