Mario D.
They do not leak!
These ear plugs will not leak, the only downside is that they do leave a blue residue/particles when removed.
Response from Mighty Plugs: The World's Finest EarplugsFeb 4, 2015
Dear Mario: To eliminate any residue, simply (work or knead) the ear plugs for 15 seconds just before inserting. That will combine the ingredients and no residue will be left. Mary-customer service




