These metal-plastic unisex Oxigen gradient-lens aviator glasses are shades that you will want to invest time in protecting. We tend to forget about the condition of our shades at any given time. Stopping and looking at our shades on a regular basis to see if they're alright is something that would require too much of a time investment for most people. The differences in each variety that's offered are subtle, but noticeable, including various lens colors and frame colors. Although these sunglasses do not hop off the page and grab everyone's attention from the get go, their overall level of versatility is quite high.