- Brand: AiR - Color: Black - Accessories: Storage bag - Design: Ergonomic shape - Material: Polyester Purchased at an authorized retailer in a department store. Used once, but it didn't suit me, so I'm selling it. When used, I put on a separately sold pillowcase, so there is almost no dirt. However, since it is a used item, please refrain from purchasing if you are sensitive to this. *The separately sold pillowcase is not included. Retail price: ¥37,400 Nishikawa Air 4DX Pillow Low