Closed cell foam

[slammer 0]

 

 

Hey folks

 

Is there any "rule of thumb" on what closed cell foam size to use on what hook size? For instance

would you use a 2mm foam on a #14, 16, 18? The foam would be used possibly for a nymph wing case.

 

 

Thanks!

[Firetiger 0]

For nymph wing case I use 1.5 mm thick black foam and it seems to be working out nicely. 2 mm would be OK as well, but much thicker than that will give your fly a very fat head. I don't like those