One size adjustable fits mostnMaterial: Plastic ,Acrylic, Polyestern100 grams weightnBlade adjusts up and down for optimal protection and comfort.nProtects your whole face from sunburn, freckles and other harmful effects from overexposure to sunlight.nThis cap perfect suits the head circumference between 52~62cm. A variety of color choices, reliable price and well quality will be your best choice in this summer .Protection you from the UV damage invisible as the extremely light material makes you feeling wear nothing . Please feel free to wear it for travel, riding, golf , tennis etc.