They are a 100% natural replacement for traditional dryer sheets which means that there are no chemicals. Even if no one in your family has a sensitivity to chemicals, don't we all get too many in our systems every day?
We have tried to eliminate many chemicals from our home. Even though we don't have kids yet, I don't like the thought of us having extra fumes nor our puppies either.
Here is what's being said about wool dryer balls:
-They shorten the drying time by wicking moisture away from your clothes. Normally fabric will stick together in the dryer, slowing down the drying process, however, these will get in-between the towels and clothing. The balls will separate and pull them apart with their weight. This in turn is allows more hot air in and around your laundry which helps the dryer to heat your laundry more quickly and suck the evaporated water out of the dryer more efficiently.
-The wool ones are far quieter than the plastic ones.
-Some people who use them claim that they will last for 1000 loads.
Of course you can buy them, but there are also a few online sites that give easy instructions on how to make your own. And if you are a DIY person, they would make a nice hostess gift too. So go through your knitting supplies or possibly your grandmother's stash and try it.