Polar grit x multisport gps watchan advanced outdoor watch, the polar grit x multisport gps watch is ultra rugged, lightweight, comfortable and delivers the top training features.serenethe serene breathing system helps you relax your body and calm down your mind in moments of stress, throughout your day, with guided breathing exercises.smart caloriesthe watch provides highly accurate calorie counting based on your weight, height, age, gender, your individual maximum heart rate hrmax and how hard youre training.running indexthe running index shows clearly how your running performance is developing with the use of your estimated running vo2max.fitness testsee how fit you are in just 5 minutes without having to break a sweat with the fitness test option.sleep plus stagesleep is a core part of the recovery process therefore, it is integral that you get the best sleep you possibly can so you can properly rest and restore. The polar grit x watch follows and tracks your sleep stages to provide key insights into your overall sleep quality.training benefitkeeping going with the training benefit system that provides motivating feedback immediately after training describing the effect of the session.running programa great feature for runners, the running program provides personal and adaptive training plans that fit you and your goals.strava live segmentsmake your runs and rides more exciting with strava live segments. Receive alerts about nearby segments, see real time performance data during a segment and check your results right after you finish.energy sourcesyou can see how your body uses different energy sources during a training session with the grit xs energy sources features. The watch divides your energy usage into carbs, proteins and fats.running powersee how intense your running session is with running power which provides comprehensive insight into the intensity of your running sessions.nightly rechargesee how well you recover from your day during the night.weatherkeep up to date with weather updates ndash the watch allows you to check current weather info and a 2 day forecast.route planning with komootplan your route on komoot and import it to your polar grit x to receive turn by turn guidance to take care of navigation for you.fuelwisethe fuelwise smart fuelling assistant, helps you learn to refuel and maintain adequate energy levels during your long endurance sessions.phone notificationssync your compatible smartphone to the watch to stay connected with notifications. You can receive alerts for incoming calls, messages, emails, calendar events and more.swimming metricswater resistant and ready for action the grit x automatically detects your heart rate, swimming style, distance, pace, strokes and rest times. Distance and strokes get tracked also in open water swimming.sport profilesthe watch comes with a huge host of sport profile and it supports over 130 different sports. You can add your favourite sports to your sports watch in polar flow.fitspark training guidethe fitspark training guide helps you prepare for your pursuit to conquer the trails with ready made daily workouts that match your recovery, readiness and training history.heart rate monitorthe watch comes with an advanced wrist based heart rate with precision prime sensor fusion technology.route guidanceupload your route to the polar grit x and stay on the right path with real time guidance.hill splitterthe hill splitter feature delivers detailed data about your performance on the uphill and downhill sections of your session.specificationsdimensions 47mm x 47mm x 13mmweight 64g with wristband, 44g without wristbandmaterials extreme high strength stainless steel case with dlc coating on black colour version, glass fibre reinforced back coverdisplay type always on colour touch displaydisplay materials laminated gorilla glass lens with anti fingerprint coating, protected with forged stainless steel bezel with lugsdisplay size 1.2display resolution 240 x 240 pixelsbattery type 346mah lithium polymerbattery life 40 hours in training mode gps and wrist based heart rate, or up to 7 days in watch mode with continuous heart rate tracking, multiple power save options availablegps and barometer integrated gps, glonass, galileo, qzss, assisted gps for fast fix times, barometric altitude, incline, ascent and descentconnectivity bluetooth low energy, custom usb cable for charging and data synchronisationwatch time and date, alarm with snoozeui languages english, german, french, italian, dutch, norwegian, spanish, portuguese, swedish, finnish, danish, polish, russian, turkish, indonesian, czech, japanese, chinese simplifiedsensors compatible with all standard ble heart rate sensors and running cadence and power sensors as well as cycling speed, cadence and power sensorswristband material durable and comfortable siliconewrist size 130 190mm small, 145 215mm medium largeoperating temperature from 20deg to 50degc, temperatures below 10degc may affect battery life and performancedurability tested against military standards mil std 810gwater resistance waterproof wr100compass magnetometer based compass available in training mode no gps neededfeatureshill splitterroute guidanceadvanced wrist based heart ratefitspark training guidesport profilesswimming metricsphone notificationsfuelwise smart fuelling assistantroute planning with komootweathernightly rechargerunning powerenergy sourcesstrava live segmentstraining load prorunning programtraining benefitsleep plus stagesfitness testrunning indexsmart caloriescontinuous heart rateserene breathing exercisebuy polar run gps from chain reaction cycles, the world's largest online bike store.