100% Blocking Light Human engineering contour can improve 99% lightproof performance, to achieve a total darkness, perfectly match nose of any height. 3D Contoured Design NO pressure on the eyes, allows you to blink freely, and don't touch your eye makeup, increase REM sleep. Improved Adjustable Buckle Gentle, pain-free, easy-to-adjust headband wont tangle hair or snag pillow. Fully adjustable strap from 18.5 inches to 27.5 inches. Suitable for Any Sleeping Position Whehter you sleep on your back, side or stomach. Tilt ultra-fit sides, avoid moving, no pressure on temple. Best Sleep Tool A good helper for you to eliminate fatigue, improve sleep quality and give you more energy to work and study. Fit for Travel, Shift Work, Meditation, Yoga etc. Suitable for different kinds of occasions such as indoor, outdoor and camping.