Chesterfield Pioneer/S is a Full Rim frame for Men, which is made of Metal Front and Acetate Plastic Temples.Most metal frames are made out of Monel. Monel has a copper and nickel base and is one of most commonly used metals for frame manufacturing. This metal can be corrosion resistant, strong, and easily adjusted. It retains its stability and shape for long periods of time. ----- Acetate is the most common material used for frame manufacturing. It has endless possibilities for color, texture, and patterns. It can even be laminated to create great visual effects, and it can retain a higher luster. Acetate is lightweight, so it is often chosen for its versatility in coloring as well as for its comfort. Acetate is made out of cotton seed fibers and plasticizers. This model features a Rectangular/Aviator shape, with a Double Bridge.This frame features a spring hinge, which keeps its initial balance and adjustment, thereby avoiding the need for subsequent adjustments.These Chesterfield Pioneer/S Sunglasses flatter people with the following facial features: Long Nose.Alternate Fit. Alternate Fit frames have a specially designed bridge for those with higher cheekbones and wider nose bridges. Alternate fit ensures the frames rest on the nose and prevents sliding.These Sunglasses work well for people whose style is: Classic, Stylish Designer, Cool/Trendy.Ideal for usage with: Fashion, Everyday Driving.Chesterfield Pioneer/S Sunglasses come with a cleaning cloth and protective carrying case.These sunglasses are available with polarized lenses on certain colors. Polarized lenses have a filter within the lens that blocks the wavelengths of light that cause glare. They can greatly enhance contrast and allow for greater depth of vision, especially in water. They are ideal for any situation where glare reduction is necessary, like driving or playing sports.