F Gilbert State Forest, Foxboro, MA
I'm a slightly slim 5'10, 160lbs and got the medium. Fits perfectly. With a somewhat thick sweatshirt underneath it fits a little snug but not too tight to be uncomfortable or restrict motion. I looked at a few more expensive jackets but glad I decided on this one. Price, fit, features and quality are great.
I ended up getting a medium though I may swap it out for a large as it's a little snug. Not tight but it could be hard to layer under. Otherwise great jacket.
I'm looking for a somewhat lightweight jacket for spring/fall (in New England). Seems like this jacket fits the bill just right? (BTW, I'm 5'10", ~150lbs so I'm thinking medium)