I got the guys at "Custom fit guards" to take a mould and went with the CF dual drivers and a pass through filter for some outside noise. I also opted for a short lead, 20cm from the Y joint in the cable. Not cheap, in the region of £215 but the sound quality is outstanding, the volume is almost turned down to its lowest setting on my Cardo bold. The full range of tones are fantastic. Not in any way uncomfortable to wear. I did an 1100 mile journey in under 22hrs without any discomfort. Good luck with your search