A4s

The custom molding process took a couple weeks but the fit is flawless, and I can wear them for hours without any soreness. Isolation is so good I barely hear the train anymore.

Getting these molded to my ears was worth the wait, and the isolation on stage is honestly ridiculous compared to universal tips. The custom fit means they basically disappear in my ears during a two-hour set.

Ordered the custom fit and the isolation is genuinely on another level — I wore them on a four-hour flight and barely touched the volume. The stage tuning is neutral enough that I could mix with them too, not just monitor. Worth every bit of the price jump.