Comparing the above CX500 to this diagram of the SE215s, I don't think a mod is possible to make the Shure foam sleeves work with the Sennheiser design.

Thanks for the quick replies. Are there foam sleeve options for my CX500? Browsing through Sennheiser.com doesn't reveal much, I may have to place a call with their parts and repair department. Will Shure sleeves work with the CX500 design below? An email replay from JH Audio referred me to...

I ride a motorcycle and the wind noise and bikes exhaust combine for an uncomfortable experience without protection. My Sennheiser CX500 are decent but don't come close to my ear plugs rated at 32 dB reduction. I value comfort during long sessions, high-quality materials, and sound quality as...

Can anyone compare the passive isolation of these IEMs to ear plugs with a similar rating (~26dB)? I ride a motorcycle with plugs rated at 32dB reduction, and my Sennheiser CX500s just don't offer anything close to that. I'm hoping a set of custom IEM will take the edge off my exhaust while...