Silky fabric on the back The back part and the band are made of a satin feeling material. Cute, light weight, satin strap and not tight of your head so you don't feel trapped. The bands are around the right length so it holds on your head but not too tight that gave pressure to your eyes. And the silk satin covered elastic band doesn't crease your hair when you sleep on it. Keeps things nice & dark too. Comfortable and blocks all light Perfect for someone who are sensitive to lights at sleep. It's a good large size mask which covers up everything sight. Soft and thick enough to keep the brightest light out of your eyes. Perfect sleeping mask. Use them any time to help you sleep during the bright morning hours. Comfortable to the eyes Elastic head strap, very soft, does not let in light. The elastic is just enough to hold in place. Keeps the light out and feels good on face/eyes/head while sleeping. The elastics do not hurt behind the ears or head. Flexible for different types of faces. The mask itself is fluffy enough that you can mold it to your face no matter what shape it is.