I find Keens to be mostly true to size. I wear Keen shoes daily and they work great for me. The Nxis Speed shoes not only look nice but they have a great sticky sole. I've worn these many times and the one issue I run into is how small the toe box is. I have an enlarged right big toe knuckle but I can get around daily pain by sticking with my tried and true Keens. These, however, are a little tight on top. You may want to size up if you need to stretch out the top of you toes.