So I bought these TWO years ago as I started looking into barefoot running, but since I live in the city, I can't exactly go out running safely where there's glass and potholes galore! So I bought these thinking "hey, if they don't work, they were only $15(at the time)" So I bought em, and loved em. I hadn't used em in awhile and in the past couple of months have used them in trails, treadmills, streets, and mud puddles, and boy have they held their share of the bargain! I gave it a star off because after a particularly wet mud run, the fabric liner off the insole piece started coming up, but no biggie, just rip it off and continue on, it doesn't ruin the shoe, unless the bottom of your foot minds that there isn't a thin liner of yellow fabric on the foamy insole. Mine don't! The grip on the bottom is like sticky rubber, and it's great, I feel it gives me just the right amount of traction on treadmills and sidewalks, plus it feels just the right amount of cushy! They're great, but they do tend to run a 1/5 size big....just a heads up.