The yellow and green Dryerballs have different tensile strengths (one is harder than the other) and different shaped softening nodes. The two dryerballs have been designed so that they work in combination to lift and separate the laundry whilst tumble drying. The Dryerballs also retain heat and transfer it to the clothes as they tumble, thus aiding the drying process. There is no need to add a "softening" dryer sheet or use fabric softener in your wash. The dryerballs use the specially designed nodes to physically break down the stiffness created by water drying in fabric, thus softening your laundry without the introduction of toxic chemicals.

Dryerballs have been scientifically tested to ISO standards at an independent, fabric care laboratory and have been proven to:

-Noticeably soften fabrics
-Reduce drying time by up to 25%
-Reduce creasing in laundry
-Cut down on lint (waste fluff)