System 3 nose pads are unique design nose pads. They may at first appear to to be mono or slide-on nose pads. However the difference between System 3 nose pads and slide-on nose pads is primarily the way these nose pads are mounted onto an eyeglass or sunglasses frame. Slide on nose pads slide down into an open hook where the system 3 nose pads actually fit through an opening in an enclosed nose pad arm. Now even though the idea of mounting is a little different than other methods of mounting nose pads, they are not confined to a particular shape. There are three different shapes associated with the system 3 mount nose pads, they are;
1. Rectangular - most common used system 3 nose pads
2. Teardrop - second most popular method, usually found on a select few eyeglass brands
3. Oval - Not a common nose pad, actually comes in 2 sizes