Our ZipFoam™ compound is lighter

Our specialty FKT Insole provides a responsive step-in feel

and breathable fit with added visual interest

Connect offers a removable insole and a finished footbed

NOTE: We suggest going up a half size due to the bootie construction

MTN Racer 4 Ultrafly 5 // Men Our ZipFoam™ compound is lighterWOMENS A fan favorite for race day and daily training, the Topo Athletic MTN Racer 4 offers rugged performance on technical trails. A 33 x 28 mm platform delivers underfoot cushioning and a protective barrier between you and the ground. Our new upper is fine tuned for performance on technical terrain. The MTN Racer 4 now features our FKT insole, allowing for faster water drainage and added rebound, while our improved gaiter attachment system keeps out