From the webpage:
The latest addition to our Achaemenid Persian range are these hard-hitting heavy cavalry.
Persian nobility (azata) would have made up the ranks of the Persian cavalry. Contemporary depictions show cavalry wearing short sleeved cuirass with very high neck protectors, these were likely covered in iron or bronze scales. For added protection an iron or bronze conical helmet with a crest was often worn. The scale leg protectors of the later Achaemenid army’s were not used at this time. Instead quilted trousers would have been worn. As with their other clothing, these would have been richly dyed and embroidered.