Dekoni Audio Mercury Bulletz Memory Foam Ear Tips, Medium, 3 Pairs

Awesome tips. They do require holding them in your ears for 10-15 seconds after you squeeze and insert. Then they work perfectly. I've got them on my Sony WF-1000XM4s and the isolation is better than the originals and the durability is worlds ahead. I bought a 3 pack of different sizes first and then 3x medium pairs so costly in the end but as a distance runner, having a perfect fit and not worrying about sweat, salt, sand or dirt ruining these is worth the cost.

En las imágenes se muestra un set de diferentes tamaños de almohadillas, pero el producto contiene todas las almohadillas del mismo tamaño.

Amazing foam eartips fast shape reform allows these to be easily removed and reinserted

These are fine for what they are but they were a disappointment to me. First, they're too short (ie, not enough length on the foam) so the isolation was only so-so at best. Second, the foam itself is more like a foam mattress than the memory foam some competitors use, that compresses to a thin roll and slowly expands in your ear. These compress and expand basically immediately, you can't compress, insert and wait for them to expand. This made getting these deep into your ear with a good seal even harder. The result is that the IEM was robbed of bass, and the treble was sharpened by comparison, making these sound less pleasant as well. They're not bad, but they're just not good. Comply foam from one of their more isolating sizes will almost certainly be better. These will no doubt last longer, but - does that help when they're less fit for purpose?

Pros: I've had comply foams and the ones that came with my FiiO FH7. These seem more durable and softer, hard to describe but they don't easily get pinched and bounce back pretty quickly equating to a "plusher" feel. The sound isolation is pretty good, but not much different from the other foams. Cons: I've noticed that if I accidentally punch it with my fingernail or something, the surface seems to crumple like paper. It's more of an aesthetic issue, and not as bad as other foams for it would probably have torn. I had the wrong size so I'm returning these and isolation does matter and gets affected so FYI.