Electrify your run and revive your workouts with the Speedform XC — built for runners who trust in Under Armour's elite construction. Perforated upper with ultra-sonic seal for durable breathability. Seamless-heel cup with silicone grip for a locked-in, anatomical fit. TPU heel counter for stability without piling on weight. Smooth, ultrasonic welded seaming with for next-to-skin support and comfort. Full-length 4D foam sockliner contours to you foot's exact shape to eliminate slippage. Full-length Micro G foam turns cushioned landings into explosive takeoffs. Anatomical outsole for natural fit and performance. Traction lugs extend into the midsole, engineered for off-road grip and stability. Wt. 8.5 oz.