There's speed and then there's UA Flow speed. Lightweight, rubber-free and durable, our newest cushioning delivers a fast, grippy feel that connects to the ground as you train to go all out. Comfortable flat-knit upper with dynamic zonal stretch, containment and breathability where you need it most Reinforced heel design with additional foam for added heel support and security Winged tongue for support and support in the midfoot with additional foam to eliminate pressure on the top of the foot EVA sockliner for added spring and resiliency with each step One-piece, softer and lighter Flow midsole for responsive, long-lasting cushioning Flow technology eliminates the rubber outsole and creates a lighter, more fluid ride on any surface Super-durable, grippy outsole pattern for a smooth, natural underfoot feel.