I purchased these double ragg wool mittens size small because I had a pair (same size) that were wearing out. The ones I received are quite small (much smaller than my original size smalls). I do love the mitten but I wish that they didn't make them so tiny. One of them I received was so tiny I sent it back. Your Gear Club was very nice about it and replaced it with no problem.
Hands down, these are absolutely the best mittens around. I've worn a pair daily for almost five years while pole-trekking up into the woods and they've performed perfectly without showing any signs of wear. Despite their durability, I figured that I needed a back-up pair. The pair I had were marked small and fit perfectly, so, of course, I ordered a small size. The manufacturer had apparently changed the sizing because the pair I got would have made a great nose-warmer. The folks at YGC graciously exchanged for medium sized and they're great but considerably larger than my original size small. So, the upshot here is definitely order these mittens but be very careful about sizing because, if the diferential follows a normal curve, a large size would make make a great pair of Volkswagen-cozies.