Boys' thermal long-sleeved T-shirt KILPI NATHAN-JB is made of fast-drying material OPTI-DRY, which is pleasant to the touch, extremely elastic, well removes moisture from the skin and thus maintains thermal comfort. The T-shirt has a round neckline. Seamless flat-panel knit and a snug fit that follows the curves of the body and maximizes comfort when moving and wearing. We offer NATHAN-JB in two colours and several sizes. We also recommend buying Kilpi NIEL-JB underpants as a great set not only for skiing, hiking, but also other outdoor activities.Material composition: 53% polyamide, 41% polyester, 6% elastane