These gloves are consistent with the major American based brands we carry such as FirstGear, Tour Master, Joe Rocket, etc, so hopefully you’ve had some experience with buying gloves and can choose based upon the fit of a previous pair. If you have no previous experience with glove sizing, go here for help.
If anything, I found the gloves to be just a touch on the snug side. Certainly not so much I’d advise you to buy a size up, but if you frequently are between sizes and can’t decide, then err to the larger size.