I don't know but the frames have a tendency to break from the bridge. I broke one at the store when I was trying them on. I still bought another model of the same brand that ended up breaking after 2 years of use while I was cleaning them, and you guessed it, from the bridge area. So, if you consider 2y the life of the frame, then great. I have other flex frames that are older than that and are still going strong.
Insignia does, although it's only being sold through Best Buy
JLab Audio's is the company that manufactures JBud earbuds and is also very popular for B-Flex portable USB laptop and desktop speakers and their products are found in a variety of stores like Amazon.
Polaroid Eyewear was created in 1937.
General Eyewear was created in 1997.
Revision Eyewear was created in 2001.
Some people have to wear eyewear in order to correct defects in their vision such as near sightedness and far sightedness. Other people may wear eyewear in order to prevent headaches and migraines. Some people wear eyewear without lenses to look cool.
Roberto Cavalli eyewear have a high cost compared to other brands of eyewear. In general, a Roberto Cavalli product will cost at least $200 and can go up to $500.
The regular flex is a stiffer flex than the mid flex. A regular flex is comparable to an 85 flex. The mid flex is closer to a 75 flex.
Spyglass Eyewear is to the right of the headquarters building on Main Street. (see related question)
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AMAVII merges art and science to create a distinctive line of fashion designer eyewear. They marry the two aspects of art and science to bring you the creme de la creme of designer eyewear. cutt.us/3AnBw
Matsuda does.