G2 Sizing

XX-Large: Base of palm to tip of middle finger length: 7-1/2".
X-Large: Base of palm to tip of middle finger length: 7-1/4".
Large: Base of palm to tip of middle finger length: 7".
Medium: Base of palm to tip of middle finger length: 6-3/4".
Small: Base of palm to tip of middle finger length: 6-1/2".

If unsure, size up for a looser fit or size down for a tighter fit.
For the complete size chart, please see the second image on the product listing.