The Wens Lens Ultra Cool Blue (Original and Electric Ice) is 2 pieces
of glass adhered together surface to surface with an optical adhesive,
preventing any debris or moisture building up between the 2 glasses.
The bottom side is the actual welding filter which gives the welder
protection from UV and IR rays and meets all required welding lens
safety standards. The top side is a new technology glass which has the
mirror coating built within the glass which prevents it from being
scratched off and also extends the life of the lens. This new
technology glass has a definition/clarification enhancement and filters
out all except for Blue Lightning.