De or het kadering?

The correct Dutch article is:

de kadering

Rule Words ending in -ing: almost always de. See the rule

How to use kadering

the kaderingde kadering
this kaderingdeze kadering
that kaderingdie kadering
our kaderingonze kadering
your kaderingjouw kadering
every kaderingelke kadering
which kadering?welke kadering?
a big kadering / the big kaderingeen grote kadering, de grote kadering

Dutch words ending in kadering

omkadering

In compound words, the last part decides the article. See the rule