This Command hybrid patrol shirt for men is constructed of 100% polyester in the arms, collar, and shoulders. VaporCore® by 37.5 Technology offers extra performance ability and is used in the fabric of the torso to delay sweating by speeding up the evaporation process. The men’s shirt has an athletic fit so it can be worn underouter vest carriers. It offers UVA and UVA protection to fight the sun’s rays and keep the colors bright. This shirt can be used as a single layer or worn underneath an AeroShell for better performance.