Several posts on this side make mention of tent "skirts". For example:
- A "skirt" at the bottom of the tent, which makes outer tent reach the ground, so wind is not beating into the inner tent;
- it has these skirts at the bottom sides covering the tent;
- and Skirt. If you care a lot about wind and sand, then you should look for a tent with a skirt.
I found some for sale here, but without a picture. Google Images appears to show tents with an extra flap at the rainfly, but the rain would have to be extremely horizontal for rain to hit the inner tent that way. Is it for single roof tents?