I have had a sample immersed in water and left to dry with no shrinkage whatsoever, considering what is now known about the carpet it's no surprise, many of the crucial carpets cannot be wet cleaned, i had one about two years ago, i tested a sample before attempting to clean it and it shrunk a lot, it was a woven carpet they also do the seagrass and other natural fibres that cannot be wet cleaned, but it seems that some can