I've tried numerous sleep masks over the years and this is hands down the best so far. Love how it blocks all light, stays in place even when I sleep on my side, has absolutely no velcro which means I can just slide it on without opening and closing the velcro each time, the size is adjustable, and it is also comfortable. Only negative is that it says hand wash. Usually you can machine wash these masks so I wonder if it would fall apart if I put it in the machine? I might try it and see what happens.