Purchased January 2024. 3 boxes with 3 sets per box. I have a lot in stock, so would anyone like some? ◆ When you're concerned about the spread of coughs and sneezes When sleeping during the dry season, at hotels, on the Shinkansen (bullet train) or airplanes. ◆ The steam effect keeps your throat moisturized for about 10 hours. The moisture in the filter turns into steam through breathing, moisturizing your throat. With plenty of moisture, the moisturizing effect lasts until morning. *The duration may vary depending on the environment. ◆ Easy breathing with breathable non-woven fabric and a special shaped filter Mask: Uses thin, breathable non-woven fabric. Wet filter: Shaped to not obstruct nasal breathing, with ventilation holes in the part that touches the mouth. ◆ Uses fine, soft non-woven fabric for a comfortable feel against the skin. ◆ Soft, wide elastic bands reduce the burden on the ears.