Adjustable eye cups mold perfectly to your face to block 100% of light. True blackout unlocks maximum deep sleep in ANY environment & any position; Fully adjustable, extra-deep eye cups allow you to blink like you're not wearing a sleeping mask;Customize your eye cups' position and angle for a perfect, personalized-for-your-face fit;Made to last with super-soft modal eye cups, breathable cotton velour strap, snag-free micro hook/micro fleece closures and industrial-grade elastics.