Derrick Spafford wrote a review of La Sportiva Vertical K Trail Running Shoe - Men's on June 13, 2012
Love the Vert Ks!
The problem with running in them is that you soon find yourself not wanting to wear anything else. With being super light, having a soft slipper-like fit and surprisingly good cushioning for such a light shoe, they are about as close as Ive come to the perfect trail shoe.
Traditionally I like going with a relatively light, but not minimalist shoe. However, this is the first time in 30 years of running that I can honestly say that Ive worn the same shoe for a long run as well as for speedwork with the Vertical Ks.
The one thing that I would caution though is if youre a runner moving from a more supportive/protective shoe to the Vertical Ks, to ease into it gradually. The good cushioning of this shoe, might have you thinking youre ok to run longer in them initially than you should. Its worth reminding people that they are still a 4mm drop shoe and need to be eased into gradually if youre used to normally wearing more of a traditional trail shoe.
The soft upper has had me doing most of my runs barefoot in them, with no blisters or hot spots even though Ive done up to 4 hours in them without socks.
The durability has also surprised me somewhat as I wasnt expecting them to hold up to higher volume as well as they have. Currently, I have about 500km of running in my first pair and actually showing very little sign of wear.
Im feeling very comfortable with trying them in a 50km, and 50 mile, and even hopeful that I might use them in a 100 miler as well eventually.
La Sportiva Running Team