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. Topo&';s new upper is fine-tuned for performance on technical terrain. The MTN Racer 4 now features Topo&';s new FKT insole, allowing for faster water drainage and added rebound, while the improved gaiter attachment system keeps out debris. The VibramA(R) Megagrip outsole provides reliable traction and durability, delivering serious performance when the trails get gritty. Compatible with the Topo Switchback Gaiter. Specs Best For: Trail Running, Race Stack Height: 33mm (heel) // 28mm (forefoot) Heel to Toe Drop: 5MM Weight: 10.4 OZ (M9) Gaiter Compatible: Yes Rock Plate: No Cushion: High Underfoot Feel: Responsive Support: Neutral