The measurement to take here is from the start of the wrist to the tip of your middle finger (the longest one) in a straight line. Gloves can also vary slightly from one manufacturer to another, but this guide should help.
Gray-Nicolls Powerbow6 Thunder Gloves
A classic pre-curved finger design with Cashmillon Fill on the first finger.
Select leather palms allow for improved grip and feel.
A two section thumb offers improved flexibility.
A double side, elasticated sweatband absorbs moisture for increased player comfort.