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PC refers to polycarbonate, which is a kind of plastic (referred to as PC), which is a polymer containing carbonate groups in the molecular chain. PC material lenses are simply plastic sunglasses lenses. And there are a variety of colors to choose from.
There are many types of plastic for sunglasses frames, but acetate is the most popular. Another benefit of plastic or acetate frames is that they are sturdy, which makes them great for holding and concealing thicker lenses with strong prescriptions.
The curved plastic frame requires heat to reshape. If your frames are plastic, they are more likely to break if you choose to adjust them yourself. Other times, it's not as easy to break as you think.
The shelf life of the plastic frame is about five years. Another weakness is that the nose pads are not as grippy as those on the metal frame. Plastic also deforms when heated, and plastic frames lose adjustment more easily than metal frames.