We always get the Rambo Fly Buster (think it's the same as the rambo protector bumblelion recommended) for our two boys, it's fab and it's so durable! They're always arguing and grabbing at each others rugs and these are the only ones that can handle the abuse, they last forever, never rip / tear and don't slip either! Brilliant rugs - http://www.rideaway.co.uk/RAMBO-FLY-BUSTER-WITH-VAMOOSE
Rambo protector fan here! ;-D They are brilliant tho expensive. I had one for my TB and its perfect for him now also have one on our Connie X and ID X perfect fit for all of them. I managed to pick one up on Ebay for only £31! Not perfect condition but brilliant bargain if you look out for them.
Would love the newer vamoose ones....