stopping sand getting everywhere

looking for help as last year we went to gran canaria and spent time on the nudist beach and going again this june, we saw a couple with a what we can describe as a fitted bed sheet upside down so you are lying down inside and a canopy above, this seemed to stop the sand blowing over you as the sides of the sheet stopped it, now wondered if these are available to buy anywhere or do we need to make one, hope someone has seen these on the beach or better still know where to buy them..
also when stopping in playa del ingles are there any small beaches reachable by local buses that are nudist beaches that you can recommend please

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