First off, probably what most people are interested in: I am a 5'11" 160lb male and wear a 10.5-11 Nike and 9.5 Converse. The size 10 of this shoe fits great without socks and is a touch snug with socks.

Quality is great and it is extremely comfortable. Took these through several muddy hikes in Hawaii and they did great. Two issues that I found: 1) the holes in the bottom are the perfect size to pick up rocks. They are a pain to get out and are uncomfortable to walk on because the sole isn't very thick and does not offer padding. If you're not walking on gravel, then no issue. 2) the insole is mesh, as well as the holes in the bottom. This works very well for draining water, but not so well when walking through mud. It comes oozing in because there isn't any form of barrier. Since mud doesn't drain as well as water, it can become quite uncomfortable if the mud is a bit gritty. A better design would be to have a solid insole and drainage out the side or edges.