The new fenix 5 product line is available in two sizes: the sleek, smaller-sized fenix 5s with 42 mm watch face, and the compact performer fenix 5 at just 47 mm Get More From Your Workout with Less on Your Wrist all units share a stainless steel exo-antenna as a bezel and a forged steel back for the best integrity in demanding environments elevate wrist-based heart rate with new fully integrated sensor provides improved 24/7 monitoring - no chest strap required higher resolution outdoor optimised chroma colour display for great readability even in bright sunlight detects and tracks activities (incl. Stairs climbed and intensity minutes) and sleep 24/7 to give you a better overview about your activity level switch wristbands in seconds without the need for any tools - just swap; click and go fenix 5 supports strava live segments group track allows you to follow all members in a group; making sure no one gets lost during joint activities go out for hours with enhanced ult