The Single Layer Tube neck gaiter is designed for mild temperatures and high-intensity activities. The lightweight single-layer TREO fabric is breathable, moisture-wicking, and thermal regulating to protect you from the sun, cold temperatures, and wind. With 4-way stretch, helmet compatibility, and multiple wearing applications, the Single Layer Tube is a perfect addition to your pack. The Details One size fits most adults - Head Circumference: 21" - 23.75", Crown Length: 7.25" - 9.26" TREO is a breathable, 4-way stretch fabric that is both freeze-resistant and abrasion-resistant, featuring a soft-touch, next-to-skin feel for comfort. Its construction ensures optimal thermal regulation and moisture management, with UPF50+ rating. Versatile design with multiple wearing applications. Dimensions: (approx.) 18.5 (L) x 10 (W) inches. Fabric Content: 80% Polyester, 20% Spandex