Low - Rebound Memory Foam, Soft and Comfortable.No pressure on eyes, eye space is wider and deeper than other flat eye mask (Silk mask will oppress eyes)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. Memory foam makes you feel comfortable.Fit all size head circumference, fully adjustable buckle strap, easy to adjust and not catch hair.