Over the years, I've owned several brands (and many pairs) of cycling gloves, including another model of Giro's. I have smaller hands than many men, so I normally wear a medium in other brands; however, from the previous Giro gloves I've owned, I needed a large size in their gloves so that's what I ordered. This pair was STILL too small. While I can get them on, it almost takes a pair of needle-nose pliers to remove them!
I have pretty small hands but these gloves in a size small fit me perfectly. The gloves should be a little tight to begin with but will break in after a ride or so. You can find cheaper gloves but those tend to be pretty shoddy in construction and most of the time don't have gel inserts. I find these gloves to be really comfortable while providing protection. Like most cycling apparel was in a delicate bag and air dry since they can get kind of rank after a bunch of rides.
I love this glove and have had a pair for 3 years! Its time they get replaced but only because I cycle a lot in the sun and they are a bit faded and the gel is worn some. They still fit well and have held together excellently! I wash them on cold after each ride and hang them to dry. I ride over a thousand miles a year and this pair get used most of my rides but about 3 months. Im here now buying a second pair!
I've ordered from a few different places and have received the wrong gloves each time. I ordered an older version, and that is the one I wanted but each time did not receive. Both companies offered a partial refund if I kept the gloves. So now I have 2 pairs I don't want and am still looking for the ones I do want. It's a hassle to return things, and I wish these companies would make sure their descriptions were accurate.