5'7" 155-160lb mixed ecto/mesomorph...purchased small. Always worried about fit because I'm short with somewhat built (38") chest, thin arms. I chose to size down and glad I did. Wanted form fitting because I have grown to hate loose flappy clothes while riding on any bike. The jersey fits snug but not restrictive. The zipper runs the full length on the front and measures 20", which is long enough to not to show any skin under bib shorts when standing. Sleeves have enough length for good coverage, no elastic cuff, fits just right with no loose material. Design is exceptional, no huge logos but enough style to not be boring and for visibility to blind drivers. Material is smooth and soft. Has held up like new after several washes (delicate cycle). Recommend.