Endurance athletes are raving about Craft's Active Extreme X CN LS Baselayer, and soon you will be too. This long-sleeve baselayer jersey is engineered for racing and high-intensity workouts. You'll feel warm in mild to cold weather conditions, and you'll have freedom of movement thanks to superior stretch and an ergonomic fit. Mesh inserts at the armpits enhance ventilation, along with Coolmax Air Technology that provides exceptional body-temperature management. A waffle-knitted design enhances moisture transfer and comfort, and the baselayer's flatlock seams work with your body to allow flexible movement.