Slow Rebound Memory Foam, Soft and Comfortable. No pressure on eyes, eye space is wider and deeper than another flat sleep mask (Silk mask oppresses eyes) Human engineering contour can improve 99% lightproof performance, achieve total darkness. Unique heat-bonded technology instead of glue, sturdy and durable, no easy to fall apart. Top-quality fiber fabric never stains bed sheets or pillows. Low - Rebound Memory foam makes you feel comfortable. For all size head circumference, fully adjustable buckle strap, easy to adjust and not catch hair. Effectively block light and allow your eyes to freely blinking. Ideal for meditation, yoga, travel, nap, insomnia. Each pack Contains 1 Item based on your check out count of selection