Double Lens Spacer Foam and Double Lens block moisture and eliminate fogging while allowing for optimal breathability. Air Control System (ACS) ACS ventilation incorporates lens air intake vents on the goggle lens and frame air outtake vents on the bottom of the goggle resulting in a sophisticated ventilation system against condensation and fogging. Antifog on inner lens Enduro double lenses include a soft inner lens which features a stronger built-in antifog solution than any other SCOTT lens. When riding Enduro races fog should never be an obstacle.