So far so good. Only a few days. (had some bad luck with the last purchase from this brand/model) But the chair beneath it is was completely dry after two significant rain storms. The chairs they are used to cover are protected by an overhang, so they just need to keep them dry from rain blowing in sideways. Fingers crossed...will see.   

 

Pros:  Good price. Easy to use. 
Cons:  The last one I purchased of this brand for my loveseat has developed cracking/holes after about 75 days.