With the Bose Ultra Open Earbuds Black, you can safely work out thanks to the open-ear design. This design means that the contact point of the earbuds go into your auricle. Sound enters your ears via sound waves. This keeps your ear canal free and you can hear both your music and surroundings clearly. Thanks to the ear clip, they sit firmly in your ear. They don't fall out easily while you're running, for example. With Bose Immersive Audio, you experience the music like you're right in it. Music sounds detailed and has depth, so it'll feel like you're at a festival. the earbuds have an IPX value of 4, so they're water-resistant. They can withstand sweat, so you can feel free to work out with the earbuds in.