NIKE Mens Metcon 2 Training Shoes Green Abyss/Gamma Blue 819899-334 Size 13 synthetic-and-mesh Flywire technology provides a locked-down fit. Abrasion-resistant film helps protect against high-heat friction. Low-profile TPU heel clip helps minimize drag during wall exercises. Abrasion-resistant film wraps the midfoot for durability during friction. Sticky rubber in the forefoot offers excellent traction.