negro Nike Dunk FLEXIBLE STRENGTH. DYNAMIC FIT.TheNike Free Trainer 5.0V6 AMP (Texas) 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.BenefitsLightweight mesh upper offers excellent ventilationNo-sew overlays throughout provide support and durability without added weightFlywire technology integrates with the laces for dynamic support and lockdownLow-profile Phylite midsole provides a resilient ride and is durable enough to double as an outsoleHexagonal flex grooves allow for natural range of motionWaffle outsole pistons work with the Phylite midsole to help absorb impactProduct DetailsMinimal, molded sockliner mimics the curvature of the foot for enhanced supportRubber pods in the heel and toe offer durability in high-wear areas3/4-length bootie wraps the foot for a seamless fitAnatomical heel is rounded to roll with the groundNike 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.