I have very small hands. Slightly wider, but still narrower, according to Black Diamond's size chart, than their Small size (and much shorter at 6.75 inches). So I ordered medium. As soon as I put them on I clenched my hands to make it clear my circulation was going to be negatively affected, these mittens were SO tight. Of course my arms were my arms, the mittens were also over an inch longer (seemed more like 1.5 but it's hard to measure), they appeared at the top of 2 or 3 lists of "warmest mittens" The Ultimate Black Diamond mittens look like they could *could* be a lot wider and more realistic, but for now where Black Diamond goes I'm definitely in once-burned mode. If you have very small hands, they certainly feel *warm enough* to top these warmest lists.
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