I've had trouble over the years finding ear plugs that would make a consistent seal against sound. I've tried various types, including the compressible foam, but nothing seems to work all the time. I use ear plugs when riding my motorcycle, under my full face helmet. These plugs work great and are very comfortable. They're also very easy to remove (not so the compressed foam, if they're just a little too far in). I've had no problems with the ends touching the inside of the helmet and have since bought several more, including some for my riding buddies to try. My only complaint is that the included case doesn't hold up to repeated use - the "hinge" just doesn't last - but the plugs have held up nicely for a couple of months now.