YouZee Clip-In is manufactured at Plastteknik, Ostvik, Skelleftea in the North of Sweden.
The material is a Polyamid PA12 called TR90. This material is extremely tough and durable, regardless of high or low temperatures.
A clip from the manufacturing:
Our supplier of lenses is Japanese Hoya and is one of the leading manufacturers of quality lenses in the world. The material is called CR39. In the event of a larger visual errors, we use lenses of higher index, all in order for your Clip-In to work optimally.