Extreme Warmth Adjustable WindStopper Alpaca Hat- Stops the Wind, Water & Odor by Alpacas of Montana Alpaca Fleece 100% Alpaca Fleece GUARANTEED TO BE SHIPPED WITHIN 24 HRS. The warmest hat you will ever wear  guaranteed. COMFORT CONTROL: Whether youre hitting the trails, the slopes, or the town, our WindStopper Hat line is built for keeping you cozy and warm when the temperatures drop. Moisture-wicking, water-repellent and breathable for a warm, dry head that stays comfortable all day. PERFECT FIT: Bungee system and convertible visor and earflaps ensure the most custom, versatile fit. The hat brim protects your eyes from the sun without interfering with your peripheral vision and the protective neck cape provides the ability to guard the sides of your head, ears and neck from the elements when you need it most. If the weather warms, the brim and earflaps can both be folded up for full ventilation and more comfortable fit. WARM WEAR: Double layered, fully lined construction protects you from the fiercest cold while wicking away moisture and still allowing your skin to breathe. Made with WindPro Polar Fleece & Alpaca Yarn, our Extreme Warmth Alpaca WindStopper Hat is built to last and keep you warm for many years to come. Durable and designed to easily transition from cool to extremely cold weather. QUALITY GUARANTEE: We guarantee this is the warmest winter hat you will ever own (applicable down to -20F) or your money back! SIZING: Circumference of Head: Small: 18.5-20.5", Medium: 21-22.5" (Most Women), Large: 23-25" (Most Men), X-Large: 25.5-27"