Performance Technology: Terramar® Qwik-Dri™--Electrostatic evaporation outperforms normal moisture-wicking fabrics. * UV Protection--Fabric is treated to block UV (ultraviolet) radiation from the sun, helping to prevent sunburn. * Ventilation--Mesh or breathable fabric inserts in high heat zones allow sweat to evaporate and cool air to circulate. * Fabric Content: 100% filament jersey silk