dan100343049 wrote an answer about Arc'teryx Beta FL Jacket - Men's on March 10, 2013
I have both A&B FL... If you're going to use a pack or climbing at all I would go with the Beta... It has reinforced areas on the Shoulders and Arms. The fit and sizing is similar on both. Just the pockets and reinforcements differ. Both have a nice droptail in back. And You should go with a Large. The Medium will be too tight. IDK if you can layer anything at your size with a medium. I'm 205 5'9 and wear an XL. I can get an atom LT under no prob still keeping the athletic fit.