The Rider Hat Delta cap is designed using the popular Flexfit DeltaA(R) hat. According to flexfit.com the hat "embodies a fusion of advanced technologies, designed to enhance the wearing experience both internally and externally. It incorporates Stain Blocking Technology, aided by ActiveGuard(TM) Technology and its three-layer multifunctional sweatband, effectively countering unwanted staining. Complementing its streamlined design, this cap is further equipped with Water Repellent Technology. Flexfit DeltaA(R) stands as dependable headwear meticulously crafted to ensure your utmost comfort." 92% poly / 8% Spandex. Sizes (head circumference): SM - MD: 55-58cm, MD - XL: 57-60cm, LG - XL: 58-61cm