Long Sleeve Sun Shirt- Vapor Apparel® SOLAR BLOC – Long sleeve sun shirt is made of 100% Polyester. This long sleeve sun shirt has a set in sleeve, and it is ideal for wearing as a cover up or to protect yourself from the elements. The long sleeve sun shirt is perfect for use on its own or as an under layer when you need extra warmth. The long sleeve sun shirt features PURE-tech moisture wicking properties and M-Shield antimicrobial technology that fights odor. These two technologies keep you dry and fresh throughout your day