Uni Filter entered the air filtration industry in 1969 with a simple concept, “Let’s design an air filter that works!” And that’s exactly what we did. Our engineers chose polyurethane foam as the air filtration media because of its superior dirt capturing abilities and it’s capacity to be easily cleaned and reused. Polyurethane foam had been used as an air filtration media for many years, but not until Uni Filter introduced the patented “Sock” Filter for motorcycles and small engines in 1973 did it receive mass acceptance. This dependable High Air Flow Filter launched a product line that now covers virtually all popular Off-Road Vehicles including Motorcycles, ATV’s/UTV’s and Trucks.