The Kilpi NATHAN-JB Boys' Thermal Thermal T-Shirt with long sleeves means the perfect winter in warmth for your child. The quick-drying OPTI-DRY material, which is pleasant to the touch, extremely elastic, wicks moisture away from the skin well and thus maintains thermal comfort. The seamless construction does not irritate the skin and the snug fit guarantees freedom of movement. Boys' thermal T-shirt with a round neck Kilpi NATHAN-JB is offered for both the youngest and older boys. We also recommend getting the Kilpi NIEL-JB underpants, as an ideal set not only for skiing, hiking, but also for other outdoor winter activities.