Wood from renewable sources, natural ingredients for processing and details from certified factories are used in the production with a minimal number of waste, which is also being recycled.
Hinges of BREVNO glasses have tiny springs inside. That's why they are never tight and almost indestructible in everyday use.
Glasses are coated with natural wooden oil with beewax. They can easily handle heavy rain or short swim, just sweep the drops after.
9-12 layers of thin wooden veneers bond criss-cross (like a plywood) makes frame strong and springy (in a reasonable matters)
German surgical steel nosepads with medical silicone pads allows to adjust BREVNO glasses to any nose.