Coros Apex 4 46mm Headband Potassium supports normal muscle function**

Potassium supports normal muscle function**

cushioned step-in feel

quick-dry comfort

The reinforced toe box and the additional cushioning on both the heel and Achille's tendon protect friction zones and keep you running for longer- chafe free

15g lighter than version 1: Updated construction delivers a smoother

Coros Apex 4 46mm Headband Potassium supports normal muscle function**The Coros Apex 4 is engineered for mountain athletes who demand precision, durability, and elite performance in the harshest environments. Built with an alpine grade titanium bezel and scratch resistant sapphire glass, its designed to help you train harder, climb higher, and race further all while delivering ultra accurate GPS, fast mapping, advanced recovery data, and best in class battery life. From steep trail ascents to long ski tours and high