Made of 100% top-quality natural silk on both sides, polyester adjustable strap, PP cotton insert. Comfortable Sleepmask is important to help you feel relaxed and inducing the feeling of sleepiness. It is released in response to darkness, so if your room is too light when you try to sleep, just put the sleep mask on, you will feel much better in sleeping. Ideal for travel, on the plane, in the office. Great for company promotions and travel giveaways. Customized logo is welcome.