De or het sportschoeisel?

The correct Dutch article is:

het sportschoeisel

Rule Words ending in -sel: usually het. See the rule

How to use sportschoeisel

the sportschoeiselhet sportschoeisel
this sportschoeiseldit sportschoeisel
that sportschoeiseldat sportschoeisel
our sportschoeiselons sportschoeisel
your sportschoeiseljouw sportschoeisel
every sportschoeiselelk sportschoeisel
which sportschoeisel?welk sportschoeisel?
a big sportschoeisel / the big sportschoeiseleen groot sportschoeisel, het grote sportschoeisel