It fits slim for a barely-there feel and has perforations to keep air circulating

Heel stack height: 42mm

it's the perfect companion for hill and mountain runners who need extra protection when wind chill sets in

the Fell Cap is engineered to repel the elements and built to go the distance…no matter the weather

Men's Topo Athletic MTN Racer 4 Size:10.5 It fits slim for aThe Topo Athletic MTN Racer 4 is a performance tuned, high cushion trail runner built for fast and long runs on technical terrain. 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 now features a slightly snugger fit throughout for extra security on technical trails. The Vibram Megagrip outsole offers superior traction and slip resistance on