what is this type of hood called?

[ballastbelly]

i saw a hood on a youtube pesca sub video , but dont have the link anymore
the diver had a sort of 'scarf' under his hood with a hole for the snorkel.

does anyone know what this is called? is it for cold weather  /for jellyfish or for camoflage?  thanks

[baghira]

Chris at aquatica has them.
Just for jellyfish.
I can't imagine how to leve it in your head for 6 hours!!!!
My friend has one... never used it..