Terramar Sports Women's Thermasilk Jersey Bottom 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