An adapter for attaching to an earphone includes a sleeve capable attaching the adapter to the earphone and an ear portion including a tubular sidewall having a first end attached to the sleeve and a second end opposite the first end. In one embodiment, the tubular sidewall includes an outer surface and a plurality of fins extending outwardly from the outer surface. In another embodiment, the tubular sidewall has an inner surface defining an air channel extending through the sidewall, and the inner surface has a twin cone shape including a converging cone portion extending from the first end and a diverging cone portion extending from the converging cone portion to the second end. In one embodiment, the adapter includes both a plurality of fins, and a twin cone air channel.