The Free Metcon 6 supports every grunt. Nike has added even more forefoot flexibility to this adaptable trainer and reinforced the heel with extra foam, providing freedom for dynamic movements during plyos and cardio classes, plus the stable base you need for weights. The outsole has laser-siping for better flexibility, and the big-toe side of the forefoot is rounded for better agility and quickness when making sudden movements. More foam in the heel provides improved stability. Laser-siped foam in the forefoot and midsole offers comfort. The upper is made of breathable, supportive engineered mesh with built-in stretch where needed. Flywire cables give you a dynamic fit and help keep you secure. The multi-surface traction pattern is made for any workout surface and activity. The comfortable inner sleeve increases ankle support and provides a more seamless fit.