I have extremely weird ear canals and no, I mean absolutely NO in-ear earbuds will stay in my ears for longer than 15 minutes, even with the christmas tree earplug-style tips on them. For that reason I am relegated to either my bulky but beloved Sennheiser WH1000XM4 headphones (or, even less practical: my wired planar magnetics) or... airpods 3. Somehow despite trying every brand of "not-in-ear-ear-bud" a-la Airpods/Earpods I have found absolutely nothing that has the frequency response of Apple's design. The fidelity is nothing to write home about but I'm not missing any of the music. Even well-regarded "flathead" earbuds, conversely, simply have no response whatsoever below 120hz.

Sony.

What about IEMs with custom earmolds?