Did you know washing a single polyester jacket can send 1,900 tiny synthetic micro-fibers into waterways? Micro-fibers come off of the fleece and other synthetic clothes in the wash and are small enough to bypass filters, and float into the ocean. Sea-life often mistakes these micro-fibers for food, and the micro-fibers eventually work their way up the food chain. While companies like Patagonia are working hard to find a solution, here are things you can do in the meantime:

Wash your fleece every 6-7 wears (or longer)

Spot treat when possible

Put your fleece in a bag when washing

Clean the lint filter regularly

Use liquid detergent

Fill your washing machine to the maximum

More information here: http://www.outsideonline.com/1998166/plastics