The Speedo Biofuse spikes are made of a material that combines the properties of plastic and rubber. Therefore, the earbuds are soft, flexible and very pleasant to the touch. This material is also well resistant to chemicals such as chlorine.

Although I don't normally use earplugs for swimming, I would happily wear these earplugs for a longer workout. They fit nicely in my ear and didn't press anywhere. But beware, the earbuds are not symmetrical, so you need to pay attention to the markings of the right and left earbuds.

Because of their shape, they stayed firmly in my ears and I didn't have to stress about them falling out with a sudden head movement. After swimming, I took the earbuds out and didn't have a drop of water in my ear. What a dream. No clogged ears, no water coming out, just beautiful. Another big plus is that the earbuds were stored in a small plastic box, so they won't roll around loose in my bag and catch dirt on them.

I only found one small downside and that is that you can't hear much through the earbuds. If you want to talk to someone or listen to a trainer, you have to take at least one earbud out. This is not ideal as it reduces the protective effect of the earbuds. So they're more for solo swimming.

I would definitely recommend them for those who have problems with ear infections and don't want to go swimming because of it. The earbuds will protect your ears from the water so you don't have to worry about anything.