This lightweight RedHEAT ACTIVE men's base layer crew neck top lives up to its name with optimal body temperature regulation. The innovative technical fabric of our men’s thermal base layer incorporates carbon microcrystals that store body heat, while its microporous structure maintains breathability for maximum comfort. The RedHEAT superior moisture management of our ski base layer keeps you dry during high-intensity activities such as cross courntry skiing or alpine touring. Perfect for an active lifestyle.