I'm not a burly guy - 5'9" and 132lbs, and yet the small sized Windveil jacket was way too tight under my arms to keep. I'm very intrigued by the fabric, as at least in one review, it promises to be highly wind-resistant, breathable and have a permanent water resistance, unaffected by the normal loss of DWR coating. I love Rab garments overall, and own several jackets and pants, but had to return these because of the poor fit.
This review was written in the old system and had content requirements that are different than reviews written today.