Is there such a thing as open back IEM? Looking for something that looks like i'm wearing nothing and I can hear outside. Wanna use it in office, so a mic helps too.

I'm using Koss Portapro with Yaxi pads, Philips SHP9500 with replacement ear pads, Aftershokz Openmove, Nuforce HEM1.

I mean I could use the Aftershokz but wanna see whether there's alternatives.