***These latex pre-glued neck seals If you’re applying on outside of suit then you should purchase PRE-GLUED to the inside of the seals.
NOTE: If you using domestic IRON ,turn of steam function off (no water) and need full heat .Don't forget to put a piece of cloth lay over the seal while you applying heat on it.
If the suit is a surface type of suit or fabric not as membrane-trilaminate suit ,you may need to use a heat shield for protect the fabric from the heat.
If your suit is a membrane-trilaminate drysuit so you should have no problem, you are not going to damage it with excessive heat.
PLEASE SEE ATACHED PICTURE FOR DIAMETERS of NECK SEAL