This kids' base-layer set is a great choice for active days outdoors: the material transports moisture effectively to the outer layers and dries quickly. It also feels comfortable against skin and keeps off the chill. The shirt has a fitted, longer back hem that gives added protection to the lower back and the flat seams feel soft and don't chafe. This style fits both girls and boys, so it's really versatile. During winter it's a functional base layer.