HOKA ONE ONE Hoka Challenger ATR 2 Running Shoes - AW16 fabric-and-synthetic Closed Air Mesh - Providing extra protection on the trail, while still ensuring ventilation. No-Sew SpeedFrame Construction - Providing a seamless interior environment for reduced irritation and blistering. Synthetic Support Strapping System - Designed for lightweight support and holds the foot in place. Ortholite Insole - Offers the ultimate in comfort, cushioning and breathability. Oversized EVA Midsole - 30% softer than traditional EVA foam, offering enhanced lightweight cushioning and support.