Black nets

[Sarah-b]

When I was at Wisley, I saw they were using black netting that wasn't like normal plastic netting, but were more like a type of nylon. They looked much easier to manage - they wouldn't get all knotted up and wouldn't rip (although they did look heavy and would need a lot of supporting).
Anyone know what these are and where you might get them from?

Thanks,
Sarah.