Design: Microfiber upper delivers extreme breathability and water absorption Rocker-shaped carbon Speedboad® Every element is engineered for performance Approved by elite-level athletes In-Shoe Comfort: Silicone inserts on the laces and insole add cushioning where you need it CloudTec® and Helion™ HF made from Pebax® deliver supreme speed, impact protection, and energy return Additional Details: Weight: 188g / 6.6 oz