I wear a 9.5, so I ordered 9.5 and it fits like a regular 9.5, meaning that it would be a good idea to go half a number lower because I won't be wearing socks with these. They fit perfectly, but I like my watershoes to fit like a glove, with my toes barely touching the front of the shoes.Do I like these? Absolutely. I'll be wearing these for hiking and going to the beach, camping in the mountains and using these when I need to give my feet a break from wearing my hiking boots. These are super light weight, flexible, the comfort is great, good traction, they look fantastic. A very versatile and well designed shoe. You just can't beat these for the price.