What size headcollar?

[Dexter]

This is an utterly ridiculous question, but what size headcollar for a 12hands ish 6 month old foal? Will he still fit in a foal slip or will he need a pony headcollar?

 

[horseylass]

I have 2 4 month old 11h fillies, and a foal slip is still too big for them

 

[Dexter]

Fab! thanks. I looked at alot of things in great detail, but not the size of his head