After a long search we found the perfect parasol cover for ourBalinese parasols. This parasol cover is 3-layered heavy duty and waterproof when standing up
(fabric is like rooftop tiles - never lay down the parasol so water can come in!) 
 
This High duty cover works excellent outside all weather.
When it gets too cold and rainy for a long time we suggest you store the parasol dry in a heated/dry place although we have tested this cover a full winter and the parasol came out perfect.