Why is the Patagonia Kids Capilene Silkweight T-Shirt so awesome? Let's start with its lightweight breathable Bluesign-approved fabric blend with 94% polyester and 6% spandex jersey. This flexible tee is also quick-drying and stays fresh with HeiQ® Pure odor control technology. Key design features include rolled forward-shoulder seams to minimize chafing plus underarm gusset panels to prevent the shirt from riding up. The Kids Capilene® Silkweight T-Shirt incorporates a slight drop-tail hem to provide extra coverage plus a convenient locker loop inside the back of the neck.