Outdoor Research Coldfront Down Mitts

Hi, I have a question about these mitts. I guess they are unisex sizing and so size L according to the sizing table should be ok for me (I am a female but with very long hands and fingers). However in the reviews elswhere I read that these mitts run quite small and I have already ordered too short mitts from another brand so I dread making the same mistake. Especially that I need them for a Nordic ski tour in Sweden starting 14th of March, very soon. I would go for black XLs just for the safety but I see you don't have this particular size in stock. So my question is maybe somebody could try the size L on and evaluate if they feel roomy enough for somebody with 20cm hand lenght and 20 cm palm circumference? I would be very thankfull! Giedre