Saddlery question - 'fulled' or 'tucked' leather???

[Morgan123]

I am doing some proofreading of the English translation of a well-known saddlery website (the original is German), and there’s a term for ‘fulled’ or ‘tucked’ leather – this means that it has been specially cleansed so as to strengthen it. I thought this term was an error as I’ve never heard of it before – but just wanted to check whether this is just my ignorance!! Anyone else heard of this (or know if there is a more well-used term, if not)?

Thanks all