As you required, I think the definition of the best sunglasses
can be considered from several aspects, such as brand, material, UV protection, and price. The best sunglasses have the feature of high quality, and sometimes they are more expensive compared with the ordinary sunglasses. Many reputed and high quality sunglasses
brands such as Ray Ban, Dior, Armani, are all famous designer sunglasses, and they are the best sunglasses as for material and UV protections. As you want to buy a pair of cool sunglasses
for your boy friend, I think the aviator with wraparound sunglasses
would be the best choice. It has been popular for a long time, and it is also an essential part of every man's wardrobe. It is the symbol of fashion in the young men, which would make your boy friend cool and handsome.