If your idea of a good run involves rocky trails and winding hills, then the Altra Olympus 4.0 Trail Running Shoe might be just the shoe for you. Designed to give you a smooth and stable ride on rugged mountain trails, this shoe features a healthy amount of midsole cushioning to keep you moving on long distance training runs, an ultra-grippy outsole that maintains traction in any conditions, and Altra's distinctive foot-forward design that'll keep you running healthy and naturally on the trail.