These Acrylic three-window poptop canvas tents are a direct replacement for the factory Westfalia canvas. This material is water-resistant and, as such, may seem stiffer than original cotton.  These are very popular to extend the camping season in wetter climates.  

Three mesh screened windows help with airflow while the poptop is raised. The side-screens do not zip out but the front does to allow access to the luggage rack.

Ref ID: VC8591AS