lol but whose, the Horseguard or the wraiths?
The Horseguard wear a style of helm that goes back maybe 200 years?
Mantics Wraiths clearly draw on the style
I don't see anything weird about it myself, the French Cuirasseurs had a similar helm. Not my field but possibly derived from the 18th century Dragoon Helm.
I think it is typical of heavy cavalry
please no jokes about polishing helmets
this is a family show
http://www.householdcavalry.info/headgear.html