To pack headphones with big sound or big features at a reasonable price, they need to have some room. Any electronic components small enough to fit within, for example, an earbud-sized housing, will either be high in cost or mediocre in quality. As a result, the best sounding headphones are often bulky, as are headphones with features such as bluetooth. The problem with this bulk isn’t necessarily the size alone, but where it’s located: outside of the ear, over the head, behind the neck, etc. Tubephones tuck the bulk neatly behind the ear, leading to a sleek, secure fit.