Review (5/5): Sleep in darkness even when you're in the light.
Description: It is a satin material with a filler used between the layers. The strap stretches and has a Velcro piece to secure it in place. It stands up to multiple washes and will last quite a long time before the straps stretch to an unusable length. It is light enough that it doesn't put pressure on your eyes but will keep out the light. It isn't tight to the extent of causing discomfort or headaches like so many others do. The two I purchased in January are still in excellent shape. I usually have to re-up every 12-18 mos.
I am a contractor so I keep one at the hotel for the work week and one at home for the weekends. I do not go to bed without it!
Helpful hint: if you have silkier texture hair, section your hair horizontally where you'd place the strap and put your jar in between the sections. Otherwise the mask will slip off.