Another Flexible Mouth Question

[D'Snowth]

I know I've asked about flexible mouths before, but instead of asking about which materials would be best suited for the job, I was also wanting to know if the thickness of the foam head would also play a factor in how flexible the mouth could be?

I'm not thinking of Kermit when I ask this, I'm asking about the earliest incarnation of the AMs, which obviously had a bit of foam in their heads.

 

[ravagefrackle]

1/2 inch , to 3/4 with regular foam, 3/8 to 1/2 inch with reticulated foam.,