FLEXIBILITY MEETS DURABLE STABILITY. Emphasizing lightweight comfort and stability, the Nike Flex Control 4 is tailored to explosive workouts. Its lightweight, flexible upper has a midfoot strap for stability, while the sole has deep flex grooves to let your foot move naturally. Lightweight Support - Abrasion-resistant mesh is lightweight and breathable to help keep your feet comfortable. Sturdy Stability - Rubber on the side of the forefoot gives you support during side-to-side movements. The laces tug down on the strap to hold your foot while you move. Natural Movement - Nike Flex sole lets your foot move naturally. Textured rubber tread outlines the sole for durable traction and stability.