Measure around the hand at the widest portion of the palm not including the thumb.
EXTRA LARGE-10 1/2"
These gloves are very nice, but there is a hole in the tip of the thumb on the left hand glove. I would have returned them but I was not going to pay the shipping fee to do so after already paying $25 for the gloves to arrive to me second day! Now I will have to try and fix the thing myself, which is not something a customer should have to do for the price paid. I wish someone would have checked the gloves before selling/sending them out!!