I own other Keen products and love them. So when I needed Safety Shoes for work, I looked at the Keen Utility Boots. I usually wear a size 12, but sometimes they are too small, and since no one makes 12 1/2 you have to jump up to a 13 which feels huge. The Keen 12's fit perfect, they are light and look small on my feet. They are also the most comfortable boots I've ever owned, steel toe or not. I don't know how durable they are going to be, but since I will be using them in a cleanroom, they will be double covered at all times. One other thing to note, they are cut down in the back, so if you have to wear bunny suits, or overall's, you should be able to get your foot through more easily.