this mask is A+ and I'm so sad it's always sold out!  It's packed full of goodies for your skin (I remember reading a skin care post about all the chemicals that are good for your skin, and a lot of them are listed as ingredients of the mask).  Also, the mask is so much fun taking selfies in haha.  

That aside, I think the rubber mask does a great job of sealing everything in - and is a great way to relax / unwind after a long day.  Pro tip:  it comes with a generous serving of ampoule, I don't use it all in the one sitting (even if I spread it on my neck and arms), so I try to seal it with a clip and use it the day after as well!