MESH! One of the best selling caps! It has great look-This classic style cap will go great with anything. It has great fit-One size with adjustable vecro strap. Easy to wear comfortably with a pony tail or messy bun. Great Quality-Mesh/trucker caps. Lightweight super soft finish. Exceptional quality. DIMENSION: Height: 4.75" Brim: center 2.75" Circumference: 22" Material: 65% cotton 35% polyester.