I am 171 lbs at 5'-10" (chest 39"). The medium size is an absolutely perfect fit! I read many reviewers that said the medium would run small on me; They were flat wrong! It is true that I won't be able to wear heavy layers under the UL Down Inner Parka (why such a long name?!), but that isn't necessary for it's intended niche.
Performance while hiking (with and without a pack) is excellent. Had
This review was written in the old system and had content requirements that are different than reviews written today.