The Rider Hat Delta cap is designed using the popular Flexfit Delta® 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™ 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 Delta® 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