No one likes when their favorite clothes develop holes or unravel after many laundry cycles. But what happens to the fragments of fabric and stitching that come off? Although it's known that washing clothes releases microfibers into wastewater, it's unclear how drying impacts the environment. Now, a pilot study in ACS' Environmental Science & Technology Letters reports that a single dryer could discharge up to 120 million microfibers annually—considerably more than from washing machines.