NJTYEstron Linum G2 cables are fantastic IMO. I have the SuperBax and Bax MMCX Cables and Absolutely LOVE them. Way better than any of my stock IEM cables, including my CA Andromeda stock Litz cable! Pricey but TOTALLY WORTH IT if you ask me. They really open up my CA Andromeda, Westone UM Pro 30 and Nuforce Primo 8 IEM's! I'm talking BIG-TIME!
Linum G2 Cables
https://www.linum.dk/shop/buy-now/
And if you want some very comfortable tips that provide a great seal, AND protect the sound nozzles from getting any ear wax or debris from getting inside of the IEM's, then look no further than Comply Tips with Waxguard aka Isolation+, Comfort+ and Sport+ Tips!
https://www.complyfoam.com/store/