The ZANheadgear® MicroLUX® Flydanna® offers soft stretchy comfort that has anti-bacterial treatment that inhibits the growth of odor causing bacteria. The MicroLUX® fabric wicks away moisture from the skin, keeping you cool and dry; making it perfect for every season. Ties in the back for a secure, customized fit. One size fits most. Great for under helmet use. MicroLUX® also provides 50+ UPF protection.