Bought size med (based on sizing chart). They were too small, returned to be exchanged for size Large. Western Bike credited my account instead of exchanging for Large. Ended up ordering a couple pair of Pearl Izumi ELITE Gel Gloves. Those are good gloves and fit perfectly.
I bought these to replace some cheap ones that wore out prematurely. They worked well on a recent week-long trek. My hand is really a medium, but the mediums were far too tight. I returned them and got large which are still a bit tight.
Long rides can be hard on the hands when you lean on the handlebars. The Giro Monaco II Gel Glove provides superior padding in the right places to prevent wear and tear while relieving pressure.
Bought these Monaco II gloves in vermillion to replace a pair of older version Monaco gloves in red & white that I wore out after a couple of thousand miles. The vermillion is a bit glaring, sort of safety-cone red rather than simple red but the color has faded a bit (unevenly...) over months of use & many hand washings. These gloves in size large are definitely smaller than the older version in large and I wish I had bought next size up. These may have shrunk a tiny amount, but it is hard to tell...just much tighter fit than old version.