Frame Considerations

Frame Material

Choosing a frame is nearly as important as the lenses, since it contributes to the durability , comfort and safety of your sunglasses.

• Metal—PROS: Easy to adjust to your face; less obtrusive to your field of vision. CONS: More expensive and less durable than other types; not for high-impact activities; can get too hot to wear if left in a closed-up car.
• Nylon—Manufacturers use different brand names for their frame nylons, including Grilamid and O Matter(TM). PROS: Inexpensive, lightweight and more durable than metal; some have high impact-resistance for sports. CONS: Not adjustable, unless they have an internal, adjustable wire core.
• Acetate and Zyl—Sometimes called "handmades," these variations of plastic are popular on high-style glasses. PROS: More color varieties are possible. CONS: Less flexible and forgiving; not intended for high-activity sports.

Hinges

These depend on the frame material. On most nylon frames, hinges feature a molded pin that's actually part of the frame material. This creates a very durable hinge. Metal, acetate and zyl frames must use either a barrel-hinge or spring-hinge design. These offer the advantage of extra flex to fit larger heads, at the cost of some durability. Higher-quality frames may use nickel-silver hinges that are more rugged and reliable.

Grippy Nosepieces or Temples

If you plan on working up a sweat, look for styles that have rubber nosepieces or earpieces that help keep your glasses from sliding down your nose.