A NEW STANDARD FOR FLEXIBLE STRENGTH. Nike Free Trainer 5.0 Amp Men's Training Shoe reinvents previous versions’ flexibility and support through the introduction of multidirectional flex grooves, Flywire cable lockdown and mesh breathability - a combination that results in a significantly lighter weight. Hexagonal flex grooves enhance multidirectional movement. Lightweight design has breathable mesh and a flexible heel counter. Flywire cables lock down the midfoot while overlays add support. Unisex shoes are available in men's sizes only. Use the chart pictured to convert a women's or kids’ size to men's.