As of this writing Astro isnt providing any additional or replacement accessories on their official website. By the way, there is confusion over the "W" next to the size on the bottom of the shoe -- that does not mean wide, it means womens size. Amazing, especially for the price. Bought for my craft room. Update: I have received the size 11s and they definitely fit better. Only drove 55 mph so will update after highway driving. These would be great to wear while Im doing my hair and getting ready in the mornings! Adaptive / Active noise cancellation is both for the audio and microphone. If I could Id give more stars! Bingo!