Designed to help you stay cool and comfy in the Timberline Insulated Cap made with Polyester pongee fabric featuring anti-microbial treatment for odor control. The Durable Water Repellent Treatment helps offers a breathable, reinforced water-repellent outer layer that is designed to resist moisture penetration, helping to keep you dry no matter how wet the weather gets on the trail. A toggle and elastic cord make for easy, snug adjustments.