It's probably the coverings they put on the lower seats to prevent them getting dirty.
no i can see the coverings but if you look at the pitch at 35 seconds in its like a beech!
So either the pitch is covered or they use a huge amount of top dressing or the video wasnt taken last sunday!
confused but i'll go have a look at skyscraper city
edit - just looked on skyscrapercity and can see the stitching machines etc so looks like the sandy look was top dressing so probably the video was a couple of weeks old