In-ear headphones from JBL that both fit well and have good sound isolation. They are also water resistant and can handle both a rainy day and a sweaty workout.
Robert Dyas
JBL LIVE 220BT - Wireless In-Ear Neckband Headphones - Black
OnBuy
JBL LIVE 220BT Wireless In-Ear Headphones Earphones Bluetooth - White