... I have tried Google to no avail - just basic home use stuff
Like
this one, you mean?

To be honest, in this case kit from both the Amazons of the world and the "well respected brands" (see above) appears - to my eyes at least - to be much of a muchness. In fact many appear to be identical, and almost certainly from the same OEM (in China, no doubt).
I wouldn't spend too much time on it; just follow whatever the Physios advise (and use themselves, even), as Dustcap suggests.
