100% Polyester 100% Polyester. Material: 100% environmental microfiber polyester- soft, stretchy, and quick drying. Item Type: Products could be worn like as: Head Wrap, Headband, Mask, Hairband, Neckband, Neckwarmer, Armband, Waistband, Bandana, Scarf, Handkerchief, Hat& more(12-in-1). Size: Approx 19.6×9.84(50*25+-1cm) with tubular knitted seamless bandana, Thickness:0.5mm. Stretchable and comfortable,one size fits all. Perfect for various sports and outdoor activities: Wear it as a headband for motorcycle cycling skiing bike fishing mountain running yoga hiking,etc.They keep your nose and mouth clean from breathing dust.