After our first big rain, water pooled on these covers, but mostly due to the shape of our chairs.  I think that if our chairs had full length cushions on them, it would have stretched the cover material further and would naturally result in less pooling.  I’m not upset though, as pooling water is a clear sign that the covers are waterproof.  The only downside is the lack of velcro or snap locks around the feet.  This model offers tie straps which can be burdensome.