You can use a GUPPYFRIEND® bag to capture microfibers when you hand or machine wash your stuff. Basically, every time you wash synthetic clothes they shed small plastic pieces called microfibers, which is leading to plastic pollution of our waterways. The Guppyfriend Washing Bag is a patented solution that filters out microfibers released from synthetic materials during washing. The self-cleaning fabric bag is made of a Polyamide 6.6, micro-filter material. 50 x 70 cm (19 11/16” x 27 9/16”) 65 g (2.3 oz)