“I live in the Chicago area so this is a PERFECT option to have handy for our long winters (and cold springs!) I’m 5’4” and 120lbs and opted for the S which is more on the snug side when you are also wearing a shirt and a hoodie underneath, but I like it that way. You could also go Medium for a bit more room :) I love the way it heats fast just by holding down for a few seconds the little logo button on the top left of the jacket. And turns off the same way if you get too warm. The only downside is having to recharge the battery - and more specifically, when I forget to recharge it, ha! So don’t forget to do that nightly if you wear it daily like I am these days! That said, just resting it as an every day vest is great too. It is still very cozy and warm with the down interior. Highly recommend!”