Take a dollar bill or credit card and click the increase or decrease button until the size of the corresponding image matches the width of your bill or card (make sure no white is showing around the edges).
Now take your left hand and align your index finger against the vertical line while placing your first knuckle where two lines intersect.
Now find the first size visible on the left side of your hand and click it.
Your base size is . If you think you made a mistake, please click the "previous" button and remeasure.
(Note: For men's sizes S thru XL we also offer cadet versions that are 1/4" shorter in the fingers. Look for the word "cadet" in front of your base size to order these gloves.)