Fit Guide SM/MD: Hat Size: 6 7/8" – 7 1/4" Head Measurement: 21 7/8" - 23" LG/XL: Hat Size: 7 1/4" - 7 5/8" Head Measurement: 23" - 24" Benefits Breathable AIRTEX fabric with one million+ perforations to enhance airflow and comfort. Quick-dry, 30+ UPF protection, and antimicrobial fabric for extended wear. Embroidered heat transfer burgee logo. Nylon drawcord with adjustable toggle. Hidden interior pocket. Insulated EVA brim for comfort and ease of wear. Details 80% Recycled Polyester / 20% Spandex. Hand wash. Hang dry. Imported. The Florence Airtex Boonie is a classic boonie reengineered through the lens of utilitarian performance innovation. Equipped with breathable AIRTEX & built for high-output expeditions.