I wear a size 8 glove and got the Womens Large, but it was too big. If you get the right size I'm sure they are great, although taking them off is a pain. The sizing chart is a little misleading so be careful and order a size smaller then you expect.
Simple yet brilliant
My hands are the precise measurement for a mens small. However, listening to other reviewres, I ordered the next size down, which is the youth's large. Perfect fit except little finger is slightly short. Perhaps that's difference between a youth and a man but I'm glad I dropped a size down, you want these to be snug. I'll just live with it for now but if it aches, I'll just snip the tip of the little finger.
I bought these for scuba diving, not for protection but for improving my manouverability. I've not had the chance to test in that environment but in a pool you can certainly tell the difference. You can also feel it in your shoulder muscles immediately and swimming is so different (in a very positive way)