They are called floating sunglasses, thanks to its frame, that keeps on the water surface. Lenses present a more complex topic. First of all, lenses are made of either glass or one of two types of plastic. Optical quality Sunglasses That Float provide the clearest vision because they are ground and polished like a fine camera lens, so the surface of the lenses are free of any imperfections. Optical-quality glass sunglass lenses are chemically or heat treated to make them impact-resistant. While glass is heavier than plastic, it keeps its shape when heat is applied. Browse this site https://gonefishingoptics.com/polarized-fishing-sunglasses/floating-sunglasses for more information on Sunglasses That Float.
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