Dryer balls are used to help dry clothes more quickly than usual as well as to soften fabrics in the dryer. When you load a big armful of wet towels into the dryer they will flop and tumble around. Normally fabric will stick together in the dryer, slowing down the drying process.

On the other hand, when you add dryer balls into your clothes dryer the balls will get in between the towels and clothing. The balls will separate and pull them apart with their weight. This in turn allows more hot air in and around your laundry helping the dryer to heat your laundry more quickly and suck the evaporated water out of the dryer more efficiently.