The Cosmo comes with external blackout thermal window screens for the front windows. The benefits of using external thermal blinds:
Thermal performance: highly effective - by blocking sunlight and cold air before it touches the glass, they keep the van significantly cooler in summer and warmer in winter.
Condensation control: they virtually eliminate internal windscreen condensation because the cold barrier is on the outside of the vehicle.
Security & fit: they hook over the top of the doors and secure around the wing mirrors, providing a tight exterior blackout fit.
Shake any moisture off them well in the morning before putting them back in the bag.
More info about the Cosmo VW Campervan.