Nike Metcon 4 X Men's Training Shoes White/Black/Dynamic Yellow : A staple in the gym or the CrossFitreg; box, the Metcon 4 X is the newest update on the functional fitness footwear that athletes love. Updated reinforcements on the shoes upper in the form of a haptic style design provide better durability where the upper meets the outsole. Athletes wanted the comfort and traction from the previous Metcons with an upper that would withstand demanding training and competition. The flat platform and durable rubber heel provides the support and stabilization needed to complete high reps and heavy lifts. Upper: An anti-abrasion film material is enhanced by the trademark Flywire lacing system. Haptic patterned reinforcement in high-wear areas keeps these shoes light and durable. Flat laces reduce irritation. Midsole: Foam cushioning offers lightweight comfort as you lift, jump, climb and run. Outsole: Sticky rubberized heel provides excellent grip during rope climbs and traction during more explosive movements like Olympic lifts.