Features of the Nike Dri-FIT Club Structured AeroBill NVLTY P Cap: Nike Dri-FIT technology moves sweat away from your skin for quicker evaporation, helping you stay dry and comfortable. Nike AeroBill technology combines breathability with sweat-wicking comfort to help reduce distractions. Heathered twill fabric is lightweight with a little stretch. Tri-glide closure easily adjusts for the perfect fit. Structured fit Embroidered eyelets Made from: Body: 98% polyester/ 2% spandex. Back of Front Panel: 100% polyester. Under Bill: 100% polyester. Machine washable