FLEXIBLE STRENGTH. DYNAMIC FIT. The Nike Free Trainer 5.0 V6 AMP (Florida) Men's Training Shoe features hexagonal flex grooves and rubber pods in high-wear areas for an incredibly natural feel and durability where it counts. Lightweight Flywire cables integrate with the laces to lock down the foot and give you an adaptive fit during multi-sport workouts. Benefits: • Lightweight mesh upper offers excellent ventilation • No-sew overlays throughout provide support and durability without added weight • Flywire technology integrates with the laces for dynamic support and lockdown • Low-profile, durable Phylite midsole doubles as an outsole and offers a resilient ride • Hexagonal flex grooves allow for natural range of motion • Waffle outsole pistons work with the Phylite midsole to help absorb impact Product Details • Minimal, molded sockliner mimics the curvature of the foot for enhanced support • Rubber pods in the heel and toe offer durability in high-wear areas • 3/4-length inner sleeve wraps the foot for a seamless fit • Anatomical heel is rounded to roll with the ground 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.