Great condition, very comfy, hold a charge, good mic quality, and they sound great. Speaking of the MMB, theres a button to unlock it so it spins like a fidget spinner. I feel like this is a good headset, but wish the process of dealing with them had been a bit more user-friendly. Non adatte per il mare. They are very comfortable, all I can say is how silly I have been not to buy them earlier! Adidas, you have let me down and BIG TIME! However, the bottom treads are not durable at all. Side tone is a feature where a tiny amount of your voice is mirrored into your ears so that you dont yell due to the sound isolation. Does what its supposed to do, mounts securely, but take up more room on the cross bars so makes it a bit more difficult to strap on surf boards vs the older system. Its kind of annoying if youve used one of the better keyboards before, which allow you to do that.