TrueFidelity 泡棉耳塞

Swapped to the large size after the mediums felt a bit loose, and now they stay put through my whole commute. The foam actually expands to fill my ear instead of just sitting there like silicone tips do.

Swapped to the large size after the mediums kept slipping, and now my IEMs finally stay put through a whole commute. The foam actually compresses down enough to seat deep, then expands for a solid seal. Only wish they sold a mixed-size pack.

I grabbed these in medium and the seal is noticeably tighter than the stock silicone tips I was using. Background noise on my commute dropped a lot once they were seated properly. Just wish they came in a multipack so I didn't have to guess my size first.