Nike Viale Tech Racer Black/White Mens Running AT4209-001 LIGHTWEIGHT DESIGN FOR LONG-LASTING COMFORT. The Nike Viale Tech Racer brings a modern, angular aesthetic to the philosophy of fast. With an athletic-inspired design, it's lightweight and comfortable for all-day wear. Mixed Materials A mesh upper with synthetic skin enhances breathability and durability. Tech Details Flywire cables provide a supportive feel in the midfoot. Lightweight Design The foam midsole doubles as the outsole, reducing the weight while providing soft cushioning.