I have a few workouts and runs in these shoes now and they work great. You can visit the webiste for all the technical specs on these shoes, so I'll focus on a few other areas. I think VIVOBAREFOOT has created a near perfect balance of minimalist shoe design, proprioception and much needed protection for the feet on trails. At times I had to look down to make sure these shoes were still on my feet they are so light and comfortable but I was still able to run aggressively on trails and over gravel, roots and rocks, which is important. If you are looking for a shoe that will allow you to run hard on trails and still follow the barefoot running style, this is it.
They come in other colors, but the ones I have are black and I prefer these over any other color. For starters, the black shoes resist stains and smears really well, and clean off easy. The style is simple, subdued and doesn't attract attention, so for the tactical athlete community, these shoes have a high grey factor. These are go anywhere shoes, on the plane, out to dinner, to the gym or on the trail. They work well for operator business casual or dressed up a bit with a pair of Mountain Khakis. Check em out.