Try this link for sizing. The Circumference of my hand is 7 and 1/4 inches and I do wear their size small gloves. Please make sure you are lokking at the mens and womens depending who you are buying for.
http://www.palmflex.com/glove-...
Circumference of the Hand in Inches
XXS XS S M L XL XXL XXXL
6.5 7 7.5 8.5 9 9.5 10 11