The smallest amount of light hitting your eyes while you sleep can have a huge impact on your melatonin levels and sleep quality. Keeping a pitch-black sleeping environment is nearly impossible with the amount of light pollution emitting from screens and technology indoors, or from surrounding street lighting. The Deep Sleep Delta Sleep Mask eliminates 100% of light entering your eyes. This creates a pure darkness for your brain, which promotes deep sleep and REM sleep. Custom-designed memory foam eye cups in the Delta mask block 100% or external light and are also deep and wide, so you’re still able to open and close your eyes. The cups are made with soft, breathable and durable materials that gently sit on your skin without applying any pressure to your eyes. Conventional sleep masks won’t always contour to all head shapes and sizes, which means light can spill through the top and sides and lead to interrupted sleep. The Deep Sleep Delta Sleep Mask has adjustable eyepieces that Velcro on and off – so you can position them exactly to your face shape. This ensures 100% blackout and a perfect fit every time.