Stratton Mountain School has trained with Protern for three seasons. The coaching staff builds video and data review into the program, working from the runs each athlete's sensor records. To take full part, you need your own sensor, and that is what this pack is for: a Protern Sensor (Live), the bib that carries it, and a Season+ Pass. What's in the Pack Protern Sensor (Live) Protern Bib (Live), designed to carry the Live sensor Protern.io Season+ Pass USB-C charging cable Carrying bag Your runs, on video, with the data on them The sensor records every run - time, splits, speed, and your line down the course. In Protern Video, your runs come back with that data on the picture, in the app, ready for you to review whenever you want. How your runs sync Connect the sensor over Bluetooth or USB-C and your runs upload to the app. Charge it overnight and go again the next day. Want live data? Add it any time With optional mobile connectivity, each run shows up on your phone within seconds of the finish, with no syncing step. Connectivity is optional and purchased separately, so you can add it later if you want it. Built for long days on the hill 15 to 20 hours of battery on a single charge. Slim shape that sits comfortably in the Protern Bib (Live), over or under a race suit. Records every run on the sensor and syncs over Bluetooth or USB-C. Bib sizing The Protern Bib (Live) is an alpine racing style bib meant to fit tightly. Choose S, M, or L based on your race suit size.