OS Visor, a full protective face shield, is designed such that it can fit to any forehead. You will need the items mentioned below to make an OS Visor. (Click the item to source it via amazon.com)
The 4mm Acrylic and the A3 Acetate sheets are laser cut with the dimensions shown in the design files. The video below shows the assembly of the OS Visor once the raw materials are ready.
If you are looking at procuring the product, contact the our listed vendors who are near your city.