Cleenaire CAF10133 The Most Advanced Protection Against Bacteria Dust Virusus Allergens Gases Odors, Cabin Air Filter For 03-08 Toyota Corolla Matrix Seven Stage Patented Protection From Dust, Allergens And Harmful Gases- The Most Advanced Cabin Filtration On The Market Both Sides Of The Filter Are Equally Protected With Activated Coconut Shell Carbon - NO MORE Dreaded Airflow Arrow! Reinforced Framing Surrounding The Entire Perimeter Provides Unmatched Stability And Sealing To Prevent Contaminated Air Bypassing The Filter Two Layers Of Activated Carbon, Four Layers Of Colbond Long Fiber, and One Electrostatic Nonwooven Needle Punch Cloth Provides Unmatched Filtration NOTE- Airflow Will Be Reduced Given Its Efficiency, Therefore This Filter Is Not For Extreme Climates Where High Airflow Is Needed This Filter Is Made For Those That Care About The Air They And Their Passengers Breathe- Satisfaction Guaranteed