material: 100% paper great quality 100% paper. Lightweight, yet thick and soft for a luxurious customized feel. Nice way to cut down some of the heat. GREAT FIT: One size fits most. Height (above top of brim) is 4.5 inches. Brim width is 4 inches. Inside circumference measures approximately 24 inches, but an internal adjustable drawstring ties to fit a variety of head shapes and sizes.