The Broad Spectrum is made of a stretchy Nylon fabric. Its wide brim protects from sun and rain showers. The term broad spectrum refers to how wide of a wave length range the fabric protects you from. A wide brimmed hat like this works in many kinds of use, regardless of whether you wear it primarily for the function of sun protection or as a fashion choice. - Stretch fabric - Adjustable chin strap - Highest possible ultraviolet protection: UPF50 (Omni-Shade broad spectrum), protection from both UV-A and UV-B - Omni-Shield repellency - Sizes: - S/M = 55 - 56 cm - L/XL = 57.75 - 61.5 cm This product is free of PFAS compounds.