I've been on the lookout for affordable, non-toxic, real blackout curtains for a while. While there are some options on the market, they're usually super expensive. This curtain is super affordable, and although it's made of polyester it's OEKO TEX Standard 100 certified. Its backing (to ensure the blackout effect) is made of "mucilage which is produced from plant material, same as children’s glue." according to JYSK's purchaser. Its color is much-much nicer in real life, more like jeans blue. Highly recommend if you're looking for non-toxic options at a great price.