How long is the service life of it? Is it fit for long face? is it Unisex?

Thank you for your questions. With High quality material, exquisite production process and Strict quality testing, the service life of our sunglasses can reach up to more than 20 years. BTW, the maintenance is important. This kind of sunglasses with oval lens are one of the most popular and all-match sunglasses for people of all ages and both sexes, it is also fit for most facial form -- no matter long face, round face, square face or oval face, it can show others your optimal Facial contour.

will it come with a cover?

Yes, it comes with A Pair of Sunglasses, A PU Sunglasses Case, A Paper Sunglasses Box, A piece of Sunglasses Cloth.

What color sunglasses should be worn at some formal occasions?

It is a good and easy question to answer -- the sunglasses with dark color lens are suited for formal occasions, such as the black sunglasses and the brown sunglasses.

Seems nice! Are the visual effect soft and clear enough?

Yes, the colored UV resistant coatings on the lens have great optimal visual enjoyment: 1: Effectively filter & block ultraviolet light of sunlight; 2: Avoiding blinding light and Alleviating fatigue; 3: Giving you a natural & clear vision with a large sweeping view.