What is a vinyl window in convertible top?

A vinyl window in a convertible top is the transparent or translucent rear window of the soft top. Instead of glass, it's made from a flexible, plastic material called vinyl (or sometimes a similar material like polyurethane). This allows the top to fold and store easily while still providing some degree of weather protection and visibility. It's usually much cheaper than a glass window and lighter, making the top easier to operate.