The Nike Men's KO Quarter Zip Sweatshirt features a brushed interior fabric for lasting warmth, while a mesh-lined mock neck zips up to the chin for extra protection from the elements. Zip-up long sleeve training shirt Therma-FIT fabric keeps you warm when temperatures drop Mesh-lined mock neck zips up to the chin for extra protection against the elements Side and underarm panels minimize restriction for a wide range of motion Brushed interior fabric traps heat for lasting warmth in chilly weather Care Instructions: Machine wash Fabric: 100% polyester