Here's what other sites are saying:
The Helly Hansen JR HH Dry top adds a touch of color to a girl's base layer that's well suited to highly aerobic activities. Made from polypropylene, this top will move moisture away and maintain a dry layer next to the skin. Polypropylene fabric is soft, lightweight, and bacteria- and fungal-resistant; plus, it retains its shape. The Helly Hansen JR HH Dry top's high elasticity allows unrestricted freedom of movement.