The FreeStyle earbuds have the same inner layer of thin hydrophobic cloth as the SoundSport earbuds. That's what I was told by multiple Bose representatives at different stores before purchasing my FreeStyle earbuds. Both earbuds are rated for the same water resistance so really, there is no point in spending the extra money to get the SoundSport earbuds unless you need a longer cable. Well, the cable built into the SoundSport earbuds is shorter but they come with an extension cable. You can buy this same extension cable from Bose if you really wanted to.