Koehn Cab
Koehn Weathertop Cab

The hard portion of the cab is steel sided with a fiberglass roof.  I *think* the door, side, and back windows are made out of thin polycarbonate (so they can be rolled up and down), which would need to be replaced, and the large front window is made out of safety glass.  The bottom portion, which conforms to the shapes of various garden tractors, appears to be an insulated canvas type material.  Click on any picture below to view larger, original picture.