That would be – one of the Pope’s Swiss Guards. Cool, because they’ve traded in their old metal helmets – for new 3D-printed, thermoplastic toppers.
(Thermoplastic, by the way, is a polymer made from petrochemicals – and this particular helmet is made from UV-resistant polyvinyl chloride (or PVC), made from the petrochemical building block, ethylene. PVC is one of the most versatile thermoplastics and goes into everything from vinyl siding on your house to the piping for your drinking water.)
They’re literally cool too. In fact, that was one of the reasons the Guard went to thermoplastic. When you’re out there under the Roman sun, metal helmets can be pretty brain-baking. Plastic doesn’t heat up the way metal does, and the new helmets have hidden air vents inside. Plus, the metal helmets were almost four times heavier than the new headgear – so that’s cool too.