GREAT QUALITY: This durable, 60% cotton 40% polyester hat provides comfort for all day wear, the breathable mesh backing helps to keep you cool and it will last you years. GREAT FIT: One size. With an elastic stretchy criss cross bands, the inner circumference of this hat measures approximately 22 inches, but it can adjust to measure anywhere between 20 and 24 inches, fitting several various head sizes. Brim length is approximately 2.75 inches. Easy to wear comfortably with a pony tail or messy bun.