Definition: EVA stands for Ethylene Vinyl Acetate and is the copolymer of ethylene and vinyl acetate.
When formulated into the closed cell foam that Bomber uses, EVA takes on the
following characteristics which are of great advantage for extreme eyewear:
This dense and durable foam can be found in many commercial applications, from handle grips to flotation and safety devices, from sporting equipment to childrens toys and furniture. EVA is also typically used as a shock absorber in sports shoes, and the smooth surface cleans easily with an antibacterial cloth.
Still hungry for info? Yet more can be found at Wikipedia's page on EVA.