Polar Grit X2 Pro Premium GPS Smart Sports Watch – ultimate outdoor sports and adventure watch with rough and rugged design, sapphire crystal glass AMOLED display, advanced navigation tools, and powerful sports and heart rate tracking technology for peak performance. Dual-frequency GPS and maps keep you on track to explore any environment with absolute confidence, and sensor fusion technology monitors your vitals to display crucial information clearly, even in the most challenging conditions. With extended long-life battery life, a comprehensive suite of automatic overnight sleep and recovery tracking features, heart rate monitoring, and pro-level training tools and performance metrics including vertical speed, running power, training load, and smart fueling assistant, Polar Grit X2 Pro is an essential piece of gear to explore more.