I had ordered a kit of beginner bondage stuff from amazon, and received a cheap pleather blindfold that didn't really work, so I decided to give the satin one a try. I got the classic black one because I didn't want to have to try clean eye makeup off satin.
It has two elastic straps, which means no shaking it off mid-sex (accidentally or because you're trying to peek). The double straps are really helpful for me because I have long hair, so one strap can go above the ponytail and the other can go under.
I also totally use this as a sleep mask. I fall asleep earlier than my boyfriend, so now if he wants to read late or watch tv I can just reach in my bedside drawer and I've got a comfy eye mask!