These liners are 1/4" thick. They are the only Gel liners that doesn't have any padding as it is not needed.
The Nasal Gel Liner is locked around the nose and doesn't move during sleep.
For all Nasal Masks except:
SleepWeaver Nasal Mask: which is the only mask that is made of fabric so it doesn't have a solid frame that allows the mask to sink inside the gel liner.