New Balance Men's Competitor 1/2 Zip 88% Polyester/ 12% Spandex Imported Fabric Type: Knit--Knit fabrics are made up of a series of interlocking loops that result in a flexible construction. All knits have some stretch Performance Technology: New Balance Lightning Dry --Lightning Dry is a fabric that keeps you dry and comfortable by managing moisture transfer. The hydrophobic polyester yarns transfer moisture away from the body to keep you dry. Ventilation--Mesh or breathable fabric inserts in high heat zones allow sweat to evaporate and cool air to circulate. Reflectivity--Provides visibility in low-light conditions through the use of reflective fabrics, yarns, tapes, trims, or heat transfers. Fabric Content: Celsius: 88% polyester, 12% spandex knit