This Sleep Mask really DOES block out ALL the light. Stays in place naturally, even when you move around and roll over. Super light weight, but with sturdy construction - it does NOT fall apart after a couple months like so many other sleep masks do. The elastic strap maintains its shape and elasticity. Feather soft and feather light - it barely feels like it is there. The Eyepatch doesn't smudge makeup or make your eyes puffy.