In-ear headphones from Sony that both fit well and have good sound isolation. These could work equally well for music and podcasts.
From OnBuy
Headphones Sony MDR E9LP in-ear Blue
eTwist
Sony MDRE9 Neodymium Magnet 13.5mm Powerful Bass In-Ear Headphones - Pink
This product is also available at 3 unverified stores.