I’ve used quite a variety of sound-isolating personal audio gear; around-ear cans, in-ear buds, as well as active noise-canceling models. All of them posed problems for me in one way or another. Most often, it came down to issues with comfort and how well each design could maintain a good seal on my noggin.

I was excited to find out that there are custom-fit headphone services out there, but my enthusiasm withered upon learning the price for such a thing.

Luckily there are simple DIY custom-mold earplug kits available for relatively cheap, so I dug out my old pair of quality earbuds, ordered a kit, and well, put together a very simple but satisfyingly effective project.