It's a thicker, meaning it stays inflated longer and deflates slower if punctured by something. Supposedly, it will help you save roughly 7% gas over traditional air in a year.
-------------------------------------------------------------------------------- Member # 42254's 1991 Twin Turbo
********\\\\\\\\|////////******** People who are willing to sacrifice Freedom for safety deserve neither - Benjamin Franklin - ********////////|\\\\\\\\******** Are you in the know?