Design: FlyKnit-AtomKnit Flyknit fabric is stretched, steamed and set, delivering a lightweight, contoured fit with minimal water absorption and enhanced breathability Perforated heel helps reduce the weight, while providing optimal breathability Durability & Traction: Outsole with increased stiffness and reduced weight includes 8 removable stainless-steel pins to grip the track Peaks throughout the plate provide traction, giving your foot grip as you run around turns Additional Details: Designed for 100m - 400m events