I recently returned from a vacation in Arizona. I was very fortunate to have received my new Vibram FiveFingers TrekSports just before I left. The trip was a wonderful opportunity to test them out.
I find the upper of the TrekSports, made of coconut fibre, more snug than the original Treks, made of kangaroo leather. The coconut fibre is quite stretchy while the kangaroo leather doesn't stretch at all but has cutouts in it with stretchy elastic near the topline to make the shoes easier to get on. My foot doesn't slide around inside the TrekSports at all because of the extra snugness and stretch in the material. Which is a big plus because I do tend to get blisters on my big toes wearing the Treks because my toes slip around inside the toe pockets. I was a little concerned that I couldn't wear the TrekSports with socks but this turned out to not be a problem at all. They are quite comfortable with Injinji socks on.
I took a stroll in the desert in Tucson and was surprised at how well the sole of the TrekSports performed. I stepped on some pretty sharp and pointy cactus spines and nothing went through the sole. I even looked down once to find a piece of dead cactus stuck to the side of the shoe near my arch and I didn't feel it.
The grip is phenomenal on rocky terrain. My feet didn't slip at all on any of the desert surfaces I walked; either flat, downhill, or uphill.
The new padded heel cup is really comfortable. I think this is a great addition to this shoe compared to the original KSO.
I'm looking forward to comparing the TrekSports to my other VFFs. I'll be writing a full review for Living Barefoot in the next month or so. Until then, here are some pics of them in the desert.