Polar Grit X, Rugged Multisport GPS Smart Watch, Ultra Long Battery Life, Wrist based Heart Rate, Military Level Durability, Sleep and Recovery, Navigation, Trail Running, Mountain Biking

ULTRALIGHT OUTDOOR WATCH WITH EXTREMELY LONG BATTERY LIFE: Up to 40 hours of training with GPS and optical heart rate measurement (up to 100 hours in energy saving mode), up to 7 days in watch mode with continuous heart rate measurement. At 64 g, the Grit X weighs 20-30 percent less than comparable outdoor watches. MILITARY-STANDARD DURABILITY: The Polar Grit X has passed several tests according to military standard MIL-STD-810G and is waterproof (WR 100). NIGHTLY RECOVERY ANALYSIS: Nightly Recharge and Sleep Plus Stages provide details on sleep patterns and show how the body recovers at night from the stresses and strains of the day in order to make the right decisions during the day. NAVIGATION: Always stay on the right track with real-time navigation via Komoot and turn-by-turn navigation — compass, barometer and altimeter (in training mode) help you do just that! AUTOMATIC DETECTION OF ASCENTS AND DESCENTS Hill Splitter automatically recognizes ascents and descents based on speed, distance and altitude data. SIZES AVAILABLE: M/L (wrist circumference 145-215 mm), S/M (wrist circumference 130-190 mm). For sizes S-L, both bracelet sizes M/L andamp; S/M are included.