The Garmin Forerunner 255 is a mid-range GPS running watch for serious runners and multisport athletes, sitting between the entry-level 55/165 and the AMOLED 265/965 models in this catalogue. This is the Basic (non-Music) 46mm version, with a 1.3" sunlight-visible transflective colour MIP display at 260 x 260px, wrist heart rate, running dynamics and power via the wrist, training readiness, HRV status, daily suggested workouts and Garmin Coach — a genuinely training-focused watch rather than a simple activity tracker. The case is fibre-reinforced plastic with a Corning Gorilla Glass 3 lens, rated 5 ATM water resistant, in this Tidal Blue colourway. Battery life is a strong point at this level: up to 14 days in smartwatch mode and up to 30 hours with GPS tracking running continuously, both notably longer than the smaller 255S in this catalogue. As the Basic variant it has no on-watch music storage — runners who want offline playlists should choose a Forerunner 255 Music model instead, which shares identical GPS and training features. A solid choice for a runner who wants Garmin's full running-science feature set with excellent battery life and doesn't need AMOLED or on-watch music.