With the ultimate brim and durability of the Aquifer Sombrero, you'll be ready to take on the day with no worries of a sunburn. SolarisShield construction offers UPF 50 protection from the sun. UPF 50+ products are made with UV-resistant fabrics and are constructed to protect the wearer form the harmful effects of intense sunlight. Wicking headband that draws perspiration away. The foam-stiffened brim floats in case you drop your hat into an accommodating river or lake. External drawcord adjustment in back for proper fit. Removable chin cord with cordlock holds hat in place on windy days. 86% nylon, 14% polyester. Wash separately cold and dry flat. Imported. Measurements: Circumference: 23 in Brim: 3 3 4 in Product measurements were taken using size XL (7 5/8). Please note that measurements may vary by size.