Yes they do, but much like the growing it takes time. Even in Albuquerque with less than 10% humidity on any given day it takes two to three days to reduce back to original size.
For the commenters saying they don't grow, its not instantaneous. If you want instantaneous, i'd recommend custom made sponges. these are a hydroscopic polymer and work best in room temperature DISTILLED water. DO NOT USE TAP WATER. Tap water tends to have some level of mineralization which will affect the growth rate and amount. the more minerals the slower the growth with less of a marked difference.
Date published: 2018-09-15