I'm 5'10", 200 lbs with somewhat broad shoulders and an average build and typically wear a medium in a jacket. I went with a large based upon the provided size chart and with the exception of the sleeves being about a 1/2" too long, this fit like a glove and is very comfortable. It's not a winter jacket by any means but is nicely lined with two large inside pockets and one smaller cell phone pocket. I'm used to getting sleeves shortened on jackets so it's no big deal and definitely well worth it.