Kilpi WILLIE-J is a children's functional T-shirt with long sleeves and a stand-up collar that your children will love. An ideal bottom layer for sports or outdoor activities. The material with the OPTI-DRY function perfectly wicks sweat and moisture away from the skin, is pleasantly warm, quick-drying and sufficiently flexible. Flat seams are gentle on the skin and do not irritate it. We offer this functional Kilpi WILLIE-J T-shirt in several modern color combinations for girls and boys who will love it and enjoy the winter in it.