Abstract: A mat (12) of impervious material for incorporation in an article, such as an article of footwear, for enabling airflow has a plurality of passageways (14) extending in a plane of the mat (12). At least one of the passageways of the plurality (14) is interconnected with at least one further passageway which extends substantially transversely to the plane of the mat (12). Air in passageways of the plurality can therefore flow to the further passageway(s) and air in the further passageway(s) can flow to passageways of the plurality. Air can therefor flow within the mat in two substantially transverse directions. Such a mat can be incorporated into an article to enable air flow into and out of the article.