One size fits most adults - Head Circumference: 21" - 23.75", Crown Length: 7.25" - 9.26" THERMA fabric is a midweight material designed to excel in sub-zero temperatures. It features a brushed interlock design for superior thermal regulation and moisture management, a soft-touch feel for unparalleled comfort, and a UPF50+ rating. VERSA fabric is used in the crown for maximum Thermal-Regulation. A TREO fabric shell is used around the neck for optimal performance and freeze resistance. Ergonomically designed with a performance fit for seamless helmet and other headwear compatibility. Fabric Content: 80% Polyester, 20% Spandex "The Brand New Triple Threat Balaclava. Introducing the Treble Hood by BlackStrap – thoughtfully engineered using three specialized fabrics in their optimum application for maximum performance. The TREO fabric on the head ensures seamless helmet compatibility. The inner liner features EXTEN fabric for a soft, comfortable feel against your skin, while the VERSA lower shell offers the protection needed for long days on the hill. Experience the ultimate performance and comfort, and take your outdoor adventures to the next level with the Treble Hood."