The Aventrail combines the airiness of a sandal with the comfort, responsiveness and propulsion of a trail running shoe, delivering an entirely new sensation of freedom while running and adventuring outdoors. Outfitted with a W Strapping System for secure, customizable lockdown and the HYPER-COMF midsole technology for cushioned underfoot comfort, this sandal is built to run free. Aventrail can be worn with or without socks. New to running in sandals? We suggest wearing socks at first to best introduce your foot to the new points of lockdown.