Flywire technology and no-sew skin overlays provide supportive lockdown and streamlined durability. The Nike Free Trainer 3.0 V3 White/Cool Grey/Black Men's Nike Training Shoes are made with hexagonal flex grooves and a low-profile Phylite midsole to give you a natural, flexible ride and premium lightweight cushioning.LIGHTWEIGHT FLEXIBILITY. ALL-AROUND CONTROL.Benefits Mesh and synthetic leather upper give you breathability and a lightweight feel Flywire technology in the midfoot wraps the arch to provide an ultra-light, locked-down fit No-sew skin overlays in the midfoot and toe create durability and a clean finish Phylite midsole/outsole for durability, a resilient ride and reduced overall weight Hexagonal flex grooves offer six different flex points for the ultimate in natural motion Waffle outsole pistons help absorb impact and increase responsivenessProduct Details Minimally-constructed tongue is lined with a thin foam layer for lightweight comfort against the laces Abrasion-resistant carbon rubber outsole reinforcements enhance durability in high-wear areas Anatomical heel is rounded to roll with the ground to promote natural motion Weight: 8.0 ounces (men's size 10)Nike Free OriginsAfter learning that Stanford athletes had been training barefoot on the university's golf course, three of Nike's most innovative and creative employees set out to develop a shoe that felt natural and weightless, similar to bare feet. In 2002, they examined a group of men and women with pressure-measuring insoles taped to their feet, using high-speed cameras to capture images of each foot in motion.The team spent eight years studying the biomechanics of shoeless running. The results yielded a profound understanding of the foot's natural landing angle, pressure and toe position, allowing Nike designers to build an unconventional and flexible running shoe from the inside out....The Nike Shoes more colors