Why don't you make a wireless exercise headphone? I'm not sure if you've noticed, but everyone else is doing it, and while that's often not a good reason to do something, it actually is in this case.
The only reason I'm asking you, Sennheiser, to make a wireless exercise headphone is because your line of wired sports headphones has been among the very best sounding--and the very best fitting--in the entire industry.
As you've proven with products like the Sennheiser RS220, RS185, PXC 550, MOMENTUM Wireless, and the Presence--not to mention the ubiquity of your wireless technologies in pro audio--you definitely know wireless.
This year, for the first time ever, wireless headphones have eclipsed wired headphones in terms of dollar sales. The sport/exercise headphone market is one of the most popular categories and wireless ones especially. I've been waiting for years for a move from you here. Don't get me wrong, though, your wired exercise headphones are, again, superb:
Your behind-the-neck sports headphones like the Sennheiser PMX 686 SPORTS have been my absolute favorite type of wired exercise headphones, providing minimal isolation (which is a must for me, when I want to do outdoor activities, and still be able to hear approaching people, animals, and vehicles). I've always found your behind-the-neck bands to be secure, light, and comfortable.
Over the years, your other non-isolating earbud models--like the current Sennheiser MX 686G SPORTS model--have been paragons of secure, comfortable-fitting non-headband earbuds that can withstand sweat and gym bag abuse. I love its Slide-to-Fit mechanism, which I find far more convenient than swapping out easy-to-lose fins and flaps. Don't you think a model like this that's wireless would be a strong competitor to the likes of Jaybird, Bose, and Beats? I do.
Your sealed, isolating models are fantastic for indoor gym rats. The Sennheiser OXC 686 SPORTS with their over-ear hook design are among your most secure fitting exercise pieces in my experience. And your Sennheiser CX 686G SPORTS--the sound-isolating counterpart to the aforementioned (and outstanding) MX 686G SPORTS--is another indoor health club headphone winner.
Fantastic exercise headphones, all of these. However, it's time now to free them with your vast experience with wireless technologies. Pretty please?