The Bose SoundSport Wirelesst is essentially an “open” ear-bud style headphone that effectively isolates noise. It is an in-ear headphone designed for those who don’t wish to get their eartips jammed way into their ears.
Thus the buds remain loosely in your ears, held in place by means of proprietary StayHear tips that are is made in a particular shape, in order to act as a soft seal at the opening of your canal, thereby helping to improve audio performance. Plus, there is a flexible wing that makes use of the ridge of the ear for active support, thereby imparting appreciably improved stability without the need to force the tips in.