The Invent® 4.0 round neck junior shirt offers reliable thermal protection for young athletes on any terrain. The functional underwear of the generation X-BIONIC®-4.0 has excellent insulating properties thanks to the roughened inner surface, is made of skin-friendly material and allows unrestricted freedom of movement. In the technologically pioneering Retina® process, precision machines produce an exceptionally tightly knitted material in which the functional zones are seamlessly integrated and can act precisely.