II went for a run tonight in my ultras. I live in Sundsvall in the north of Sweden. The snow is just melting away so it's too cold for me to run barefoot. As I was running I taught I got a small stone in the shoe. I saw nothing in the shoe and kept running, but I could still feel it. When I took it off I saw a small stone wedged in to the sole that went straight through it and in to my heal. There's a lot of small stones on the asphalt right now on the streets used for making the ice less slippery in winter. when I got home there were a few marks any 3-4 small stones fixed in the sole. To bad i took them away before taking this picture that shows the hole from the stone going into my heal. Isn't vivo barefoots supposed to be puncture proof? Well they are still better than crocs for wearing around the house but I will not run in them again.