The Nike Free Metcon 4 combines flexibility with stability to help you get the most out of your training programme. Updated "chain-link" mesh cools and flexes as you speed through agility drills, while support at the midfoot and heel braces you for your heaviest sets in the weight room. Design details pay tribute to an American holiday, blending the colours of the US flag with a bit of grit. Blast From the Past The 4 is bringing back the super-tough-yet-breathable mesh from the original version. The upper gets embellished with a Huarache-inspired strap and rubber-striped sidewall that envelops your heel to brace you for movement in any direction. Flexibility for Speed Nike Free technology in the forefoot creates flexibility for agility moves and sprints. Stretch around the collar lets your foot move naturally as you burst, cut and brake. Stability for Strength The flat, wide heel creates a solid base for lifting. A softer foam core cushions your foot, while a firmer outer layer is durable and stable. Wide internal webbing distributes pressure around your midfoot for a comfortable-yet-locked-in feel during sudden stops and quick cuts.