The Craft Active Extreme X Crew Neck is a highly functional base layer tee designed for racing and high-intensity workouts in mild to cold winter conditions.Thin, lightweight and elastic fabricSEAQUAL(TM) polyester produced from recycled plasticCoolmaxA(R) Air TechnologyWaffle-knitted design for maximum moisture transport and comfortMesh inserts at armpits for enhanced ventilationFlatlock seams that follow body movementsTight fit