Designed for power nap in travelling, Sleeping in day or night, yoga and meditation relaxation For eyes skin,Cotton Silk is the best natural fabric and far more superior than polyester or nylon sleep masks Most of the people in this modern day complain that they are getting enough sleep in their day to day activity Total Black out from bright light and this means room partners, life partners and people working in night shift can sleep without turning the lights off Ideal for insomnia, migraine headaches and dry-eye sufferers, as the breathable, natural fibers of hypoallergenic cotton silk allows healthy oxygen in while keeping dry air out