I can now respond with 20:20 hindsight, having just now finished cleaning up after a brew, utilising my XL Blichmann gloves.
As those of you who have met me would know, I'm not exactly a small fella, about 190 cm tall. I found the XL size gloves a little big for my hands. Admittedly, I'm not a bricky or butcher, so don't have sausage fingers, but not exactly petite, either.
Well inulated, and definitely safe, but if I had my druthers, I'd order the (L)arge. Make of that what you will.