Design: It is inspired by origami design principles that fold nicely to keep dust particles out and can easily fit in a pocket. zMask 3D folded structure holds itself up around the mouth, creating more space for breathing and talking. Also, it reduces the friction between mask and face to protect the lining from getting stained or messing up your makeup. Material: zMask is washable and made of lightweight, biodegradable natural fiber (Kraft-tex®) and 3 layers of breathable non-woven fabric. Kraft-tex is a German engineered US-made paper fabric. It is made from natural paper fiber that has been tanned, resulting in a very durable and water-resistant Products. Sizing : The mask and its earloop are both adjustable. For a small size mask, easily slide over the clear elastic band and place them on the provided notch. then, you could freely change earloop length according to your face contour. You can see video instruction here. Cleaning: HAND WASH with soap or soak the mask in the solution of bleach and water for 5 minutes. Let it AIR DRY completely. if possible, place the mask in direct sunlight. Bleach solution: Mixing 4 teaspoons of 5.25%–8.25% bleach per quart of room temperature water Use: Adjust moldable nose clip and earloop according to your face contour. This is not a medical-grade mask and is not intended as a substitute for any professional protective equipment or other recommended measures to stop the spread of COVID-19, including social distancing, washing your hands, and not touching your face. Masks may help prevent people who have COVID-19 from spreading the virus to others. Please see CDC guidance on how to select, wear, and clean your mask here