Phrygian cap under helmet?

[Servio Caro (Javier Sánc]

Thanks Giannis and John, I think I will line the lower part of the bowl and cheekpieces with leather as you say. The helmets I saw lined this way looked very comfortable

And about the upper part, with the cap or the phrigian cap, I think I will try both, anyway I always can wear the phrigian cap without helmet, and if it is hot outside I just would put the other cap only to fix it to my head. The cost of both solutions is not expensive.

I will see and tell you how it works, thanks for the ideas