HOKA ONE ONE Mens Challenger ATR Running Sneaker Shoe synthetic-and-mesh Rubber sole Shaft measures approximately 2" from arch Built for the neutral runner looking for maximum cushioning. Lightweight, supportive, seamless SpeedFrame mesh and synthetic uppers. Traditional lace-up closure. Heel pull loop for an easier on and off. Thin, sueded synthetic tongue and plush collar. Breathable fabric lining for exceptional in-shoe comfort. Fixed foam insole. Active Foot Frame midsole geometry allows the foot to sink into the shoe, instead of sitting on top. Early-stage Meta-Rocker promotes propulsion throughout the gait cycle. Oversized midsole is up to 2.5 times the volume of standard running shoes. It is designed to provide shock absorption and an inherently stable ride. Full-length EVA midsole delivers high-performance cushioning. Rubber outsole pods offers stability over uneven terrain. 4 mm lugs for all-terrain traction.