The HiFiMAN RE-400s come with four sets of eartips, flanged and unflanged, and a rubber dongle for wrapping your headphones up safely.
The HiFiMAN RE-400s Waterline cost $99. By definition, waterline is the point where a boat meets the water. According to HiFiMAN representative Peter Hoagland, “waterline” implies these headphones are “reference for its class”. Is HiFiMAN trying to say these headphones float above the rest? Maybe.