“Glove sizing is tricky, get yourself a soft tape measure. IMO the palm to finger length is a more important measurement to go off of than the hand width across the knuckles. The back of the O’Neill box actually has a size chart you can place your hand on which is the best way to get your size. Unfortunately buying online doesn’t help you. If you’re in between sizes I’d recommend going up a size. Otherwise they’ll be too snug and it’ll be a struggle to get them on and off.
When putting them on, fold the wrist inside out up to the palm of the glove. It’ll make it easier to put them on because they are snug in the wrist, helps keep water from flushing.”