These glasses come with a single clear lens. Their job is to keep wind, insects, mud and so forth out of your eyes. They're not meant to make you look like a style god, and though the arm design maybe owes something to Oakley's M-Frame, they don't. The thing is, at this price it doesn't matter too much if you fall on them or snap the nose bridge, which is how I destroyed two sets of other glasses in the last few months.
Lens wraparound is sufficient to keep wind out of your eyes and the clear lens is especially good in weak winter light - or even at night. Yellow, dark tinted or replacement clear lenses are available for £9.95, and mirrored ones for £14.95. The arms have flexible, rubber grippers at the end and they fit snug to the side of the head rather than behind the ears. The nose-piece likewise has a rubber gripper. They're comfortable and they stay on your face. Apart from style, their only weakness compared to expensive eyewear is a tendency to fog up easily when it's raining or if it's cold and you stop moving. You even get a retaining cord and a small carrying pouch.