100% Polyester Size: Available in S/M, L/XL Head measurement: S/M (56cm, 22, Size 7), L/XL (58cm, 22-3/4, Size 7-1/4) Brim: 1-1/2 Height: 4-5/8 – Crushable / Packable Occasion: Classic and sharp, everyday wear, or night out on the town, bbq party, house party, beach party, pool party, sun bathing, sailing, outdoor picnics, derby, boating all outdoor activities for sun protection. Formal attire, weddings, cocktail party, church, funeral and religious gatherings. Kentucky Derby, horse races, charity events. Perfect for vacation and cruise attire. Easy to pack will hold shape.