I'm just looking for an auxiliary cable with volume control, track skipping, play and pause that is compatible with s8 phone. It's for a snowboarding helmet.
I don't think there are any as most in-line controls are for wired headsets. BUT if you don't mind DIY stuff, you can just strip the earbuds off a pair, solder it to an AUX jack, and enjoy the ride. (Just make sure you only wire the audio portion and properly ground things or you'll get weird stuff going on from the control unit).
Sounds like it is best if you do just that, canibalize a set of earbuds with an inline remote. It seems like you are still using earbuds built into your helmet so it would just be an extensions. I would modify a female headphone jack into the chord rather than cut up your helmet's chord and splice in the remote.