I'm assuming we're talking about the same thing...we call them skid boots
around here. A firm boot (without the foot part) that wraps around the stop pad?
These are the ones I used to use for Ripley...I got them from a friend whose dog detested anything on his feet, and wouldn't play with them on. So I inherited them...and used them for Ripley a little big. He would tear up the back of his big main pad while playing flyball...the boots were much easier than vet wrapping every race.
They hold up well, unless you
forget to take them off after a flyball run and leave them on a dog who likes to chew things off their feet.
I still have Rip's old pair...I just keep them around in case of accident. They do form to the dog's feet...so I can't use them for any long period of time with the others...but I just keep them in case of injury.
Here is a site for DIY skid boots.
"I don't have any idea if my dogs respect me or not, but they're greedy and I have their stuff." -- Patty Ruzzo
"Dogs don't want to control people. They want to control their own lives." --John Bradshaw