Filtering face mask with Eco Color technology that guarantees breathability. Environmentally sustainable, safe, and thermoregulating with an opening for the insertion of an interchangeable PM 2.5 filter. Machine washable at 30° Celsius, non-toxic, breathable, hypoallergenic, soft, and ideal for prolonged use. Tested by Next Technology - National Research Society. Convertible into a bandana or neck warmer.