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 debris. The Vibram® Megagrip outsole provides reliable traction and durability, delivering serious performance when the trails get gritty. Compatible with our Switchback Gaiter.Why We Love It:5MM Drop:- Our highest available drop allows you to access natural running with more under-heel cushioning.FKT Insole:- A closed cell beaded foam keeps water out, allowing shoes to drain quickly in wet conditions.Gaiter Compatible:- Offers additional protection from dirt, rocks, and twigs on the trails(sold separately).Roomy Toe Box:- Anatomical toe box allows toes to spread naturally and comfortably.Vibram Outsole:- Unparalleled grip and traction and durability from the leaders in technical outsoles.Zip Foam More Cushioning and Resilience:- Proprietary midsole compound which is springier than EVA and offers more rebound over the life of the shoe.Specifications:- Weight: 8.5 OZ (W7)