That may well be true but they don't prevent sharp object from reaching them any better than do skinny tires with high pressure tubes as in my Felt F80 road bike; therefore that's a moot point.

Besides, I offered this up merely as a helpful hint for anyone struggling to install tire liners, not as an arguement for or against one product over another; again making a tube that leaks air more slowly from a puncture a moot point here. I'm attempting to minimize punctures not slow down leaks.