I have tried many different eye masks, and I had high hopes for this one.

Lets start with the pros:

soft mask
blocks light pretty well
does not interfere with REM sleep (like some other masks)
has a clip on the back instead of velcro

Cons:

This is a *big* one...it *won't* stay on all night!!
I have tried every adjustment possible with this mask and it will not stay on my head. It falls of several times a night and *wakes* me up!
The mask is thick, and bulky in design *not for side sleepers*, it feels like your laying on a hump on the side
of your face. Too thick!!

In summary, my search continues for a sleep mask that is comfortable and that will also stay on my head all night.