Our specialty FKT Insole provides a responsive step-in feel

Our ZipFoam™ compound is lighter

now with more cushioning and an exciting new look

On the bottom

and breathable fit with added visual interest

MTN Racer 4 Ultrafly 5 // Men Our specialty FKT Insole providesWOMENS 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