Topo Athletic MTN Racer 4 Trail Running Shoes - Women's Blue/Blue 6.5 US. The 33 x 28 mm stack height offers generous cushioning and protection underfoot while the ZipFoam midsole provides a lightweight and responsive ride. The upper features a snug fit throughout for extra security on technical trails. The Vibram Megagrip outsole offers superior traction and slip resistance on all terrain. Our specialty FKT insole delivers a responsive step-in feel with optimal drainage in wet conditions. The gaiter system features a hook and loop attachment. Specifications for Topo Athletic MTN Racer 4 Trailrunning Shoes - Women's: Manufacturer: Topo Athletic Footwear Type: Shoes Package Contents: Topo Athletic MTN Racer 4 Trailrunning Shoes - Women's Topo Athletic W089-065-BLUBLU: MTN Racer 4 Trail Running Shoes - Women's Blue/Blue 6.5 US