Patagonia made the super lightweight Cayo Largo II Shirt for humid, sticky, overheated days because it never loses its cool. With a soft, easy-wearing fabric blend of organic cotton, recycled nylon and hemp, it breathes easily, even in stifling heat. Relaxed styling, with a button-front placket and a lie-down collar, travels equally well on a Sierra trail as it does the streets of Florence. Two buttoned pockets and a hidden front-chest zip pocket (sized to fit a U.S. passport or a medium fly box) hold your small essentials securely above the waterline. With a shirttail hem to stay put under a hip belt.