I am not sure if it would cover 4 people, but it's fairly large, and seems to do the trick, although I haven't used it extensively. I did buy it because I wanted to get one which would provide enough shade to sit under, without having your feet stick out into the sun.
It's made from shadecloth, not fabric. I recon that might help it stop blowing away in a breeze, as the wind can go through it. But I haven't tested in it windy conditions yet.
I got one of these from Bunnings last year:
http://www.coolaroo.com/products/coolaroo/ProductDetails.asp…
I am not sure if it would cover 4 people, but it's fairly large, and seems to do the trick, although I haven't used it extensively. I did buy it because I wanted to get one which would provide enough shade to sit under, without having your feet stick out into the sun.
It's made from shadecloth, not fabric. I recon that might help it stop blowing away in a breeze, as the wind can go through it. But I haven't tested in it windy conditions yet.
I think it was around $40