When in comes to sunglasses made for sports, nylon is preferred due to the flexibility of the material, not to mention the fact that is tends to be extremely flexible and lightweight. Even under pressure, they have the malleability to flex and return to their original shape, this also aids in allowing the sunglasses to have a better grip on the wearer’s face. At the other end of the spectrum, metal frames tend to be a lot more rigid, making them less ideal for sports. Due to their rigidity, many models are fitted with spring loaded hinges. The arms are usually hooked and fitted with rubber or plastic in order to allow the sunglasses a better grip on the wearer’s face. Some models like Oakley have straight arms or stems.
There are three common styles in which frames are made to hold the lenses: Frameless, full frame and half frame. Just as the name implies, full frames go all around the lenses, while half frames only go half way around. There are two types of frameless sunglasses, one is two lenses connected by a piece in the middle and supported by the arms or stems on each side, the other is a single piece lens that is connected to the arms or stems of the sunglasses.
Frames can be made to hold the lenses in several different ways. There are three common styles: full frame, half frame, and frameless. Full frame glasses have the frame go all around the lenses. Half frames go around only half the lens; typically the frames attach to the top of the lenses and on the side near the top.
Frameless glasses have no frame around the lenses and the ear stems are attached directly to the lenses. There are two styles of frameless glasses: those that have a piece of material connecting the two lenses, and those that are a single lens with ear stems on each side.
The third and final part of a pair of sunglasses is the nose bridge. This is the part that connects two lenses in the middle and has little legs that sit on the nose to keep them from slipping, some styles especially those that utilize plastic material, fashion the supports into the design while other that use metal may use two rubber guards.
All together, these parts make up one amazing little accessory: Designer Sunglasses.