The wool dryer balls are an earth-friendly, skin- friendly,  and long-lasting alternative to synthetic fabric softener and dryer sheets. They are made of 100% natural wool and are a great alternative for people who want to soften their laundry naturally, while reducing drying time by 40%, preventing static cling, much quieter than plastic dryer balls, and reducing wrinkles in your clothes. Wool dryer balls are a great way to reduce the amount of laundry time you need. Just toss 3 balls in your dryer along with your laundry and you'll be done in less time than it would take to dry the same clothes on the line! For large loads, such as bedding, we recommend using 6 dryer balls.