From Hestra's site: https://hestragloves.com/sport/en/gloves/alpine-pro/30800-army-leather-wool-terry-man-woman-five-finger/440710/
There is a sizing guide about half-way down the page.
I usually wear a medium size in gloves, but decided to go with their "9-Large" due to the liner and glad that I did. The Large fit my hand perfect with the liner.
They are incredibly well made. Haven't tested them yet, but from experience can tell these will be awesome in our cold temps. They include a packet of leather balm as a conditioner.