This is my third pair of Vibrams, and I can't recommend them highly enough. After decades of dance, running, hiking and skiing, I had to have surgery on both knees. I was told to avoid running, so I  switched reluctantly to road-biking. When Vibrams came out, I was thrilled to discover shoes that did away with all the phony cushions and arches that supposedly compensate for the failures of millions of years of natural evolution. With more than a hundred bones, joints, tendons and ligaments in our feet, we are exquisitely designed for barefoot distance walking and running! Vibrams just add a little protection and tread. I've not only returned to virtually pain-free distance running, but feel sure-footed like a cat, and have developed much stronger calves and arches...The only challenge is spreading your toes to get the bleepin' things on!