Let me start off by saying that I absolutely loved these mittens. I originally purchased a pair last winter in size Medium, even after checking the size guide. The Mediums were too large, so I sold them to my friend at the amount I would have gotten had I returned them, and I ended up buying them in Small and they fit perfectly and were super warm.
Fast forward to this fall, I ended up losing one of my mittens at a sporting event, so I went to repurchase them in Small, because I loved them so much. Unfortunately, the Small pair I received this time around was significantly larger than the Small pair I received last year and did not fit me, as they were much too large (like the Medium size I received last year). Understanding they are handmade, I would expect slight variation in sizing, but Customer Service informed me this was normal and was not a quality issue. I would've tried to exchange them, but never heard back from Customer Service, so I ended up returning them instead.
Like I said at the beginning, the mittens are amazing, especially living in Minnesota, but I would not advise purchasing them online (maybe go to their store instead if you're in Duluth) as the sizing is inconsistent and Customer Service wasn't as helpful as I have experience with other companies I frequent.