IF Belts
IF belts are belts that have a layer of fabric inside their grooves. This design ensures that if the vehicle experiences pulley misalignment — meaning the pulleys engaged with the belt are slightly forward or backward — the belt does not create noise.
In some models, all internal grooves are fully covered with fabric. These belts are also called "Noise-less" belts, as they are designed to completely eliminate noise in the drive system.
These belts have very high durability and are usually made of EPDM, which provides excellent longevity and heat resistance.