The Nike Free Metcon 6 workout shoes support every grunt and growl. The trainer has more forefoot flexibility and a reinforced heel with extra foam. The outsole has laser-siping for better flexibility. The big-toe side of the forefoot is rounded for better agility and quickness when making sudden movements. More foam was added in the heel for improved stability. Laser-siped foam is featured in the forefoot and midsole for comfort. The upper is made of breathable, supportive engineered mesh with built-in stretch where needed. Flywire cables give 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.