I recommend getting 2 sizes bigger! The expanding foam tips and fins fit tight within my ears and passively blocked all outside noise effectively. adidas zx adv flux One is the correct size the other one looks like it shrunk. I also wish there was a little more bass in the speaker. adidas zx adv flux You have to firmly stretch the rubber strap that holds it on to get it in place, then it uses a smooth plastic tab to hold the ears in place with tension. adidas zx adv flux My 11 year old son loves the color of his headset. They are worth every penny. 5 inches in length. adidas zx adv flux with both pair. Since then the weather has turned cold and weve had a lot of rain so I havent worn them very much.
adidas zx adv flux