i haven't done extensive research so there could be thinner gloves out there, but i bought a pair of "edz merino fingerless gloves" a few months ago and they are less restrictive than the pair i had before

still end up with cold-ish fingers though which feels similar enough to cold hands. im thinking what i need is something like mittens but instead of something that wraps around your fingers, it would just rest on top and keep the air off while your fingers are free to move underneath