Three layer jackets with YKK zippers. These jackets are made with polycotton twills to make the jacket breathable. It comes with elastic for the thumbs. This is because it stops the sleeves from riding up. It also has a zippered chest pocket to place valuables in. The material is designed to be as thick as a bee sting. When looking for sizes it is best to start 1-2 sizes up from the size shirt you wear normally.