Thermal Underwear Kids Boys Shirts Tops Base Layer Compression Long Sleeve CLK Thermal effect / temperature preserved /moisture management with high-function fabric (Cera Heat fabric) High-function Cera Heat fabric improves thermal effect 20% more than cotton, wool for weather season It makes a nice and pleasant condition for exercises due to its super light spandex which is soft, wearable, flexible Spandex with high-elasticity allows the sweat to be quickly absorbed and dried Perfect fit to the body - high quality product Made in Korea (Korea fabric not in China)