Design: Engineered mesh with comfortable knit collar and tongue The upper locks down to provide security at any speed, while its lightweight, breathable mesh provides comfort during long runs and hard workouts In-Shoe Comfort: A high-stack combination of DNA GOLD and DNA FLASH v2 cushioning, paired with the SpeedVault plate, creates game-changing protection, propulsion, and recovery The curved geometry of the RapidRoll Rocker actively assists heel-to-toe transitions for quick turnover. Additional Details: Offset: 6.0mm