I bought a second pair for my daughter. For those saying these dont work on a Kona, I thought so too at first and then realized one bar is longer. The microphone sound quality is overall worse than any other 20$ headset. But there were so many circumstances in my testing where it was hard to believe noise cancelling was even turned on because it wasnt blocking out any sound compared to the Sony and Bose in the exact same testing environment. Materiales:Ligeros y muy flexibles, Pensé que era muy frágil, pero ha funcionado muy bien y sin accidentes. I live in a small 1 bedroom apartment and I originally had my shoes stored on a metal rack in the wardrobe (taking up LOADS of room). I love my new glasses! Its a great shoes! If you dont mind a little sorting work this is definitely a great buy. Ive never found a shoe that allows me to have no foot pain during my 10 hour shift till this one.