Product review (4 stars): An Adequate Replacement for OEM filter element
The thickness of the wick material is about 1".  It also has a wire mesh around it to support the material that does not show In its picture.  I purchased this to replace my OEM filter element in my Honeywell humidifier.  It seems to perform slightly less then the OEM one which was about 1 1/2" thick, based upon the consumption of water in the tank.  However, the water use is very dependent upon the relative humidity in the room and hard to judge.  For the price I consider it adequate for the job and will see how long it will last as compared to the original.