are this mens sizes?
Yes, these are men's sizes, I wear a 10.5 shoe. I swim 80 lengths of the pool daily, just a bit over a mile, I may incur minor foot cramps at about lap 55, but I'm able to work through it without stopping at about lap 58. The Aqua Sphere Microfin HP Fin is a good buy for the money, I highly recommend them for working out only. Not to be used for snorkeling or SCUBA.
Yes these are mens sizes. Women size down 2 sizes.