The dryer balls are made of 100% New Zealand wool and have no synthetic materials like plastics or fillers. This makes them quiet in the dryer and gentle on clothing. The felted wool balls help reduce static cling, but unlike disposable and liquid fabric softeners, Smart Sheet won’t leave behind any residue in the dryer.
I had a chance to try out a package. They really did reduce wrinkling and dryer time, which eases wear and tear on clothes and saves energy. They also worked even for my sister-in-law, who has some wool allergies. Not using fabric softener means you'll save more than you spent on the dryer balls in a short amount of time, and you'll save a little bit on energy costs too!