The Patagonia Kids Trim Brim Hat is made of lightweight Supplex® nylon with a quick-drying DWR (durable water repellent) finish and it features a circular brim that provides shade; it also retains its shape when wet. The cinch cord on the crown and a nonchafing chin strap with soft-lock adjustment secure the hat in windy conditions and tucks away when not in use. Packs small; easy care. The power of the sun is not to be underestimated these days, so a sun hat is a must.