Polar Grit X was developed to help outdoor enthusiasts push their boundaries. The watch offers a robust and lightweight design, outstanding battery life, and entirely new Polar smart coaching features. Whether you’re out on the trails or preparing for future adventures with supportive workouts indoors, Grit X comes with all the essential tools you need to power through anything. Grit X features US military-grade standard construction, designed for the roughest conditions. Weighing only 64 grams, it also boasts an incredible weight-to-battery ratio, even up to 100 hours via multiple power save options – perfect for extended adventures or ultra events