Flents 404 siesta sleep mask - satin material: polyester. Inside foam: polymer. Straps: 59.3% polyester, 40.7% rubber. Satin material - polyester. Inside foam: polymer. Straps: 59.3% polyester, 40.7% rubber. One size fits all - mask has a 2 strap adjustable fit. Assorted colors - mask comes in black, red and blue. Perfect for travel - great for creating relaxing environments while traveling. Thick design - the product has a thick design that blocks out all light.