In-ear headphones from Oppo that both fit well and have good sound isolation. They have clever buttons that you can use to quickly skip songs or answer a phone call.
From Amazon
OPPO Earbuds Type C White - MH135
OnBuy
OPPO MH135 3.5mm Headphones Earphones For OPPO Reno 2 Reno2 Z / Reno Z - White