For those winter rainy days, where line drying is not feasible, Eco wool dryer balls are a perfect tool to reducing drying time in your dryer. Eco Wool Dryer Balls are made from 100% NZ Wool, which is unbleached and chemical-free. Wool Balls are naturally absorbant and work by creating air pockets in the clothes - significantly reducing dryer time. Use all three Dryer Balls at the same time for the lanolin in the wool to naturally soften the fabric. They won't leave any fluff on clothing and last for over 1000 cycles. Simply put the Wool Balls on your windowsill to air out after your load is done.