They look like they work a little bit like Itti Bittis PP, except they're one sized! I'm a bit intrigued...
They seem to be bamboo soakers, so I don't think you'll have an issue with absorbency, it's just the fit that I can't help you with, you won't know that til you try one on your bub. Can you just get one to try first? They could be worth a shot...

Have you tried just googling them, or searching them on Nappycino? You might find some more info there.