I have a couple pairs of Keen hiking boots, so I was pretty confident in how these would fit-- your mileage may vary. I also had to buy special adapters just so she could use the charging block I just bought her for Christmas. PERO SI PUEDEN AYUDAR A CONTACTAR A SAMSUNG ESTADOS UNIDOS, Y POR ENDE YA EN EUA TE HACEN VALIDA LA GARANTIA, DESCONOZCO SI LOS GASTSOS DE ENVIO CORRAN POR TU CUENTA O LA DE SAMSUNG EUA. These tips check all the boxes plus they come with a great variety of sizes to choose from. If your feet are doing a certain dragging movement in a certain direction, then your brain actually expects you to propel forward, so it does work. Installing it on the headset was an utter pain, the plastic BARELY wanted to connect but I was able to do it. Well I have a new pair and indeed the noise reduction effectiveness is absolutely amazing. My only issue I had is that I purchased an open box but it was missing the mic/audio splitter, so that was a little disappointing. The heart rate monitor is useful as well but dont expect to have it always active (though you can set it up that way). My granddaughter loves it.