The perfect eye mask for sound sleep anywhere, anytime! The OUTGO Z-Mask Sleep Shield allows for R.E.M. Sleep, even in bright or unfamiliar places. With plenty of space for your eyes and eyelashes, you will feel none of the uncomfortable pressure on your eyelids that come from most sleep masks. Your eyes are free to be open or closed, and rapid eye movement (R.E.M.) is unhindered while you are sleeping. The patented form-fitting and light weight design make this sleep mask the perfect piece of gear for camping, travel, military, or anywhere (and any time) you need great sleep!