Eartec FUSION In-Helmet Headset

The Fusion is not a headset you wear under a helmet, it is a headset you build into one. The assembly carries two speakers and a noise-cancelling microphone on a flexible gooseneck, and it either tucks into the helmet's existing foam padding or fastens to the shell interior with Velcro. Nothing sits on the ears or across the crown, so helmet fit is unchanged.

That makes it the answer for motorsport crews, industrial rigging, and anyone whose head protection is not optional. It plugs into an Eartec E-Pak transceiver, which is purchased separately, and the gooseneck lets each user set microphone position once and forget it.