We only use the highest quality 30 momme mulberry silk Momme is the unit used when describing the weight of the silk thread. For a pillowcase, a momme weight of 19 - 22 is considered good quality, with silk sheets in the range of 22-25 is being very high quality, 30 is a true luxury. The higher quality the silk is, the more durable and long-lasting it will be. The standard for measuring momme weight is by using a piece of fabric that is 100 yards long and 45 inches wide. If that piece of fabric weighs 19 pounds then the momme weight of that silk is 19. The higher the momme weight the heavier the fabric which means a greater amount of silk was used in the weaving process. The chemical process involved in silk production has a far lower impact compared to that used in synthetics or conventional cotton production. Silk is also good for use with low impact dyes, which contributes to reducing the environmental impact of the process of fabric coloring. Mulberry silk is a strong and highly durable fabric, as long as it is treated with respect and care. It is also a natural fiber, that is readily biodegradable material after serving its useful life. You can then use it in the production of compost or mulch, instead of dumping it at the garbage site, as you would do with the majority of petroleum-based fabrics. Besides being 100% hypoallergenic, Mulberry silk is also odorless and as such will not require any “airing out.” This is a robust, breathable fabric, a major plus when compared to other wild silks. The art of raising and growing domesticated silkworms is, by nature, highly sustainable. When produced by weavers using handlooms, silk fabric leaves a near-zero energy carbon footprint, satisfying the majority of global sustainable fabric production guidelines.