To be honest it is very like the 'comfy collar', although it's not inflatable, which is probably a good thing with cats, nor does it depend on velcro to keep it in position - i'm not sure how that would fare with a really determined cat.
Comfy collars are not expensive, but the problem is you don't know that you need one until you
REALLY REALLY need it and when you do need it
you need it RIGHT NOW! you don't want to be waiting 3 or 4 days for the postman to deliver it as by then you wont need it anyway and you'd be far better off spending your money on a of bottle of wine
.
If you are a handy sort of person (or know someone who is) and have the bits and pieces needed anyway its great to be able to whip one up in an emergency - if you have to go out and buy stuff especially then it would probably work out cheaper to buy a proper one.
Here are the 'Ingredients'
1 length of 2inch diameter tubular pipe insulation,
Short Length of hosepipe
1 thick shoelace
Gaffer or other electrical tape.
The other good thing about making your own is that you can make it exactly the right size for your own cat.
Instructions to follow.......