Fly Fishing shirts are especially designed for the fishermans needs. I like mine to be light weight cool and with long sleeves, plenty of ventilation and shoulder and arm room for ease of movement when casting, a couple of large pockets and roll up collar for extra sun protection and you have a functional fishing shirt for fresh or saltwater fishing. I find this type of shirt great for trout fishing but on the boat or wading the flats I prefer the long sleeve round neck T shirt. These shirts are normaly 50* sun protection and are made from a non wicking anti-bacterial material that keeps you cool and dry. I like mine to be loose fitting for extra comfort. I have several of these shirts and they are great for travelling as they are fast drying and don't wrinkle.