The Brooks Caldera 4 is a lightweight and responsive trail running shoe that's perfect for everything from short runs on easy trails to long runs on technical terrain. It features a BioMoGo DNA midsole that provides cushioning and energy return, and a TrailTack outsole with aggressive lugs for traction on a variety of surfaces. The upper of the Caldera 4 is made of a breathable mesh that keeps your feet cool and dry. It also has a mud guard to protect your feet from debris, and a lace garage to keep your laces from getting tangled. The Caldera 4 is a great choice for trail runners of all levels, and it's especially well-suited for runners who are looking for a shoe that can handle a variety of terrain.