The versatile Outdoor Research Sun Runner Cap fully covers your neck and face when the sun is at its worst. Remove the adjustable sun skirt when all you need is cap coverage, or pull back the sun skirt for partial coverage and increased ventilation. Breathable Supplex® nylon fabric wicks away moisture to keep you cool. Mesh side panels increase ventilation. UPF 30+ SolarShield™ sun protection. Dark grey underbrim protects you from reflective glare. TransAction™ headband wicks away moisture and feels soft against your skin. External Cinch-Strap adjustment for proper fit. Removable chin cord with cordlock holds hat in place on windy days. Plastic-stiffened bill. 100% nylon. Wash cold and dry flat. Measurements: Circumference: 22 in. Brim: 2 3 - 4 in.