This lightweight hat (90% polyester/10% cotton) features a wide brim to keep your head and face covered and protected from the sun. We like to use them here at the garden center each day and they are so nice to block the sun and allow our ponytails through the slot in the back. They're so breathable, adjustable, waterproof, and give us the UV protection all day that we need. Definitely an inexpensive must have for all of your outdoor excursions. These come in one size fits most - hat roundness: 21"-23", height: 4.33 inches, brim: 3.35 inches, drawstring length: 13 inches.