SealSkinz glove size guide
Please follow these simple steps to ensure you are purchasing the right size gloves for you.
Wrist circumference
Measure your dominant hand (right if you're right-handed and left if you're left-handed). Relax your palm and keep it straight. Measure the circumference of your wrist at the knuckles .

Note - if the gloves are too tight, it can increase the frostbite, because the warm air has nowhere to collect. So if you can't decide between sizes, go with the bigger one.