Fabric:100%cotton; Lining:82%polyester/18%cotton. SIZE: best fit for 57-59cm 22.4-23.2 7 1/8- 7 3/8, with an adjustable strap at both sides. Ventilated & Lightweight – breathable to let air flow well in, so this flat cap will not overheat in summer. The comfortable sweatband also provides excellent moisture wicking. Packable – you can fold or pack this newsboy cap easily, great for cruise, golfing or hunting. If the fabric is wrinkled, you might need steam/ironing machine to reshape it, you can find the instruction from the product images. Stylish Brim – the bill offers great sun protection without blocking any visions and is great for outdoor trip, golf or just daily fashion males cap. Easy to Wash – hand wash with cool water; or spot clean; or machine washing on gentle cycle, shape it immediately and then air dry; if wrinkled you can use steam/ironing machine to recover it.