The new trail running shoes are starting to come in for the Fall season.  We just saw the TR version of the Marathon 10 released the other day and today the new Response Trail 21 GTX has been released.  The Response Trail 21 GTX is a rugged trail running shoe with waterproof Gore-tex material.  It features a breathable mesh upper with synthetic overlays for added durability.  It has an adaptive Traxion outsole for excellent grip as well as adiwear rubber for durability.  The cushioning is not mentioned, but it most likely uses traditional EVA cushioning as Boost is not present. The weight comes in at 11.5 oz.  It is currently available in one colorway in men’s sizes 6.5 – 15 for $110.