The Nike Free Metcon 4 combines flexibility and stability to help you get the most out of your training program. The revamped "grill effect" mesh cools and flexes as you accelerate through agility drills, while the midfoot and heel support wraps your foot during the hardest workouts in the weight room. The 4 revives the original's breathable, high-strength mesh. The upper features a Huarache-inspired strap and a striped rubber side wrap that wraps around the heel to anchor your movement to the ground, no matter the direction. The Nike Free technology in the forefoot provides optimal flexibility during agility drills and sprints. Extendable around the ankle, the shoe allows the foot to move naturally as you accelerate, change direction and slow down. The wide, flat heel creates a solid base when lifting weights. The softer foam core cushions your foot, while the firmer outer layer provides durability and stability. The wide inner lacing system distributes pressure around the middle of your foot for a comfortable, supportive feel during hard stops and quick changes in direction. The rubber logo on the tongue pays homage to the Huarache of the early 90s. Rubber outsole in wear areas for long-lasting traction.