NIKE Flex Supreme Training Shoes Mesh Upper - For improved breathability and a lightweight fit. Perforated Midfoot Overlays - That integrate with the laces for added ventilation and support. Phylite Midsole/Outsole - With Phylon core for responsive cushioning and durability. Flex Grooves - For a natural stride and flexibility. Shaped Ankle Collar - Padded, shaped ankle collar provides superb comfort.