Most of us wear synthetic fabrics like polyester every day. Our dress shirts, yoga pants, fleeces, and even underwear are all increasingly made of synthetic materials — plastic, in fact. But these synthetic fabrics, from which 60% of all clothing on earth is made, have a big hidden problem: when they’re washed, they release tiny plastic bits — called microfibers — that flow down our drains, through water treatment plants, and out into our rivers, lakes and oceans by the billions. Sign up now for