“I purchased a Medium for my husband. He’s 5’8” and approximately 160 lbs and the medium fits him perfectly. He loves the extra warmth in the Midwest winter and on warmer days has left the parka at home and just wore a sweatshirt and his Ororo vest, which was warm enough for him. He’s happy with it. He said it heats up quickly. This is not our first Ororo vest, love all of their products!”