Yes the Cooleroos come with tie downs. Can't say they keep out the rain, at least not the ones we have but I would think a tighter weave would. We chose what I believe is the medium light filtering since we still wanted airflow as well as some light to filter thru. When we get the typical Florida rains and sometimes with some strong winds nothing that I know of will keep the rains out other than windows. My lanai can get wet but I don't see that as a problem. Everything on my lanai including the flooring adapts well to the rains.
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