Sealskinz Ultra Grip Glove Black
I find these a little large around the wrist, so if you're petite, this may not be the style for you - look at the Sealskinz All Rounder or MacWet Climatec Sports instead.
Relax your dominant hand and measure with a tape measure around the knuckles (excluding the thumb) in inches (your left if you are left handed and your right if you are right handed).
The size that you measure in inches, is your glove size, so if you measure 9 inches, you will need a medium glove.
Please remember that if the gloves are too tight on your hands they may make your hands feel cold, so if in doubt go up a size!