The Manta Sleep Mask is the World’s 1st modular sleep mask for 100% blackout with freeFit. The adjustable modular eye contours makes Manta the best sleep mask you can get to fit your unique face for sleeping. Perfect for Power Nap, Insomnia, Jet Lag. Never Let Poor Sleep Interfere With Your Epic Life Again. Manta Sleep Mask is designed to upgrade your sleep & life with a personalized fit. It works for 99% of all face shapes & gives you 100% blackout for your entire sleep cycle.