Material: 100% Mulberry Silk Designed for power nap Total black out from bright light Best natural fabric Far more superior than polyester or nylon sleep masks Suitable for all men and woman and children. 100 Percent silk satin. Made for meditation travelling sleeping. According to the great British sleep survey 19 percent of those surveyed reported being disturbed by light levels before or during sleep. Ideal for insomnia, migraine headaches and dry-eye sufferers, as the breathable, natural fibers of hypoallergenic silk allows healthy oxygen in while keeping dry air out. Brand No Brand SKU 100960382_NP-1021500539