Brand New without box The most breathable version yet, the Nike Metcon 6 helps keep your foot cool when you're going full steam. It stands up to the push and pull of lifting and high-intensity workouts, delivering stability and durability. The Coolest Metcon Nearly 18% more breathable than the Metcon 5, this version has lightweight mesh that keeps air flowing and your foot cool. A durable screen print reinforces the mesh without sacrificing breathability.