CW-X Short Sleeve Ventilator Web Tee Womens Polyester 90% / Spandex 10% Imported Fabric Type: Stretch--Usually a blend of knit or woven fabric with spandex or elastane. Creates a soft, durable fabric which allows freedom of movement yet retains its shape through repeated wash cycles. Performance Technology: CW-X Healtha+--Moisture-wicking 4-way stretch body fabric. Anti-Microbial--Anti-microbial treatments provide permanent odor protection by inhibiting the growth of bacteria and mildew in the fabric. 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.