While the Phrygian cap was of wool or soft leather, in pre-Hellenistic times the Greeks had already developed a military helmet that had a similarly characteristic flipped-over tip. These so-called "Phrygian helmets" (named in modern times after the cap) were usually of bronze and in prominent use in Thrace, Dacia, Magna Graecia and the rest of the Hellenistic world from the 5th century BC up to Roman times. Due to their superficial similarity, the cap and helmet are often difficult to distinguish in Greek art (especially in black-figure or red-figure earthenware) unless the headgear is identified as a soft flexible cap by long earflaps or a long neck flap. Also confusingly similar are the depictions of the helmets used by cavalry and light infantry ("cf." Peltasts of Thrace and Paeonia), whose headgear – aside from the traditional "alopekis" caps of fox skin – also included stiff leather helmets in imitation of the bronze ones.