The Vibram FiveFingers Groundsplay LS is a barefoot toe shoe for gym training, with a 4. 5 millimeter sole that keeps the foot close to the floor. Micro-traction lugs add grip for weightlifting, strength work, and circuits, and the thin sole stays flexible through every movement. What Our Gearhead(R) Experts Are Saying:"Each toe moves on its own in these shoes, so I can spread them for balance when a heavy set shifts my weight. The same toe movement helps in circuits, where I change direction between stations."