UA Speedform technology eliminates distractions so you can focus on your run. Seamless heel cup with silicon grip holds your foot in place, while smooth seams provide next-to-skin support and comfort. 360-degree reflectivity to keep you safe and visible in low light. Dual-layer midsole with Charged Foam for responsive cushioning and Micro G for impact protection. 10mm offset. Blown rubber outsole with a carbon rubber heel for lightweight durability. Anatomical flex grooves create a smoother ride. Wt. 8.6 oz.