The brooks caldera 6 is a trail running shoe designed to provide a comfortable and stable ride on a variety of terrains. This shoe features a breathable mesh upper that helps to keep your feet cool and dry while you run. The upper also has a 3d fit print technology that provides a seamless and flexible fit to help reduce irritation and increase comfort.the midsole of the caldera 6 is made of biomogo dna a responsive cushioning material that adapts to your stride and provides consistent cushioning throughout your run. It also has a full-length segmented crash pad which is a system of shock absorbers that help to distribute impact and reduce stress on your joints.the outsole of the caldera 6 is made of trailtack rubber which is a sticky and durable material that provides excellent traction on both wet and dry surfaces. The outsole also has multidirectional lugs that offer grip on a variety of terrains.other features of the caldera 6 include a gaiter attachment point which allows you to attach gaiters to keep debris out of your shoes and a lace garage that keeps your laces secure and out of the way. The shoe also has a padded tongue and collar for added comfort and support.overall the brooks caldera 6 is a versatile and durable trail running shoe that is designed to keep you comfortable and stable on a variety of terrains.