Patagonia’s synthetic fleeces (along with fleeces from other manufacturers) are clogging up the oceans, poisoning the food chain and filling up landfills – and Patagonia is leading the charge to change things. Researchers from the University of California Santa Barbara found that polyester and nylon jackets, shed as many as 250,000 synthetic fibers every time you wash. And aywhere between 8 to 35 percent of this shedding ends up in waterways.