This is a low height Zucchetto made of Polyester Fabric. The base diameter is 6.5 inches (16.5cm) , and the height is 2.5 inches(6.5cm). This Zucchetto does not have any foam or stiffness inside.

Zucchetto is a small, hemispherical, form-fitting ecclesiastical skullcap worn by clerics of various Catholic Church rites, the Syriac Orthodox Church, and by the higher clergy in Anglicanism. The colour for a priest is black, for a bishop purple, for a is cardinal red, and that for the Pope is white. (source: www.newadvent.org)