I didn't know about the nozzle diameter when I ordered the zero. Too big for my ears, I had a similar issue with the moondrop quark even tho the nozzle is thinner. Etymotic ER2SE have even thinner nozzles and I find them much more comfortable despite the added depth. Either way, I got my zeros to seal with the smallest xelastec tips without pushing them all the way in making them comfortable enough to use.