I have always wanted to try these! - UE Fits Earbuds - YouTube
Amazon.com: Ultimate Ears FITS True Wireless Bluetooth Custom Fit Earbuds, All Day Comfort, Built-in-Mic, Premium Audio, Passive Noise Cancelling Earphones, 20 Hour Playtime, Sweat Resistant - Dark Blue : Electronics
UE Premier review: How $3,000 earbuds almost ruined music for me | Digital Trends