Sunspel Polo Shirt. This Sunspel Polo Shirt is called the Riviera polo. This polo shirt is constructed from a mesh Supima cotton fabric making it lightweight, Breathable and very comfortable to wear, Slim fit, Made in Portugal. Sunspel, founded in 1860 is an innovative British brand with a contemporary edge. Sunspel make luxury clothing. Founded by Thomas Hill Sunspel is wardrobe essential.