With memory foam, this soft, comfortable mask avoids eye pressure, as the eye space is wider and deeper than other flat sleep mask (Silk sleep mask oppresses eyes) Human engineering contour can improve 99% lightproof performance, to achieve a total darkness. Unique heat-bonded technology instead of glue, sturdy and durable, no easy to fall apart. Top quality fiber fabric never stain bed sheets or pillows. Low – Rebound Memory foam makes you feel comfortable. For all size head circumference.