I normally wear size 13s but i went with 14 for these. The 14 were a good choice. These definitely run small. Apart from the size up, they work great. I use them in the gym for lifting, the work great for dead lifts due to the flat bottom. They are also extremely durable. I had some Matflex 5 for more than 3 years and they still look brand new. These are the same design as the Matflex 5, except they look cooler with the color choices. I recommend these. Oh yeah, i also believe they are good for wrestling lol. I haven't been able to confirm that last point.