I bought these a few months ago as a replacement set for my iPod. I was looking for something that would block out sound yet was still easily portable. I found both attributes in these. With the volume less than half up it blocked out all of the sound in a moving vehicle including conversation. The only problem I've had with them is that since the silicone has begun to really form to my ears, they tend to either wander out of the canals or get stuck in there. It's no real problem, though, so I'll keep using them until they just completely die. Definitely a great product and the best sound I've ever heard form earbuds.