Outdoor Research Women's Arroyo Bucket 100% cotton patterned fabric, 100% Supplex nylon (on reverse side) Imported SolarShield construction; UPF 31 Lightweight, breathable 100% cotton patterned fabric reverses to Supplex nylon solid fabric Brim: front - 3 1/2" / 9 cm, back - 2 1/4" / 6 cm