Bose Sport Earbuds come with three sizes of StayHear™ Max tips, so you can find the right fit for you. Every surface that touches your ear is made from soft silicone—not hard plastic—and by applying pressure evenly across your ear, the eartips avoid putting extra pressure on the most sensitive parts. Meanwhile, the unique umbrella-shaped tip and the extended flexible wing keep your Bose Sport Earbuds securely in place—without the need of an ear hook—no matter how much you shake your head or jump up and down.