The Vibram FiveFingers Groundsplay is built around the brand's Max Feel approach, with a 4. 5mm sole and micro-traction lugs that put the training surface as close to underfoot as possible without removing protection entirely. The articulated toe construction lets the foot spread and engage naturally during lifts and balance work, and the EcoStep Recycle compound outsole delivers reliable grip on indoor surfaces with recycled material content. What Our Gearhead(R) Experts Are Saying:"The double-closure system is what makes this shoe work for serious lifting because the foot stays locked in place through the whole movement. The ground feel the sole delivers actually translates into better force transfer at the floor."