The Nike Free Metcon 6 workout shoes features more forefoot flexibility. The heel is reinforced with extra foam. The outsole is laser-siped for better flexibility. Laser-siped foam in the forefoot and midsole offer flexibility and comfort. The upper is made of breathable, supportive engineered mesh. It has built-in stretch. Cables give you a dynamic fit and help keep you secure. The multi-surface traction pattern is made for any workout surface and activity. A comfortable inner sleeve increases ankle support and provides a more seamless fit. These are lace-up sneakers.