The Horror Dome foam filled; latex mask keeps its shape. 
This mask does not stand on its own (if you want to use it as a pro) you will have to put something inside of him for it to stand up.
I used this as a prop. 
We did take some of the foam out of the mask because it was too tight, but the foam is included, and you can decide if you want it in the mask or not. 

6/25/24 - Recent pictures added. In VERY good condition!! 
Still has the price tag on it. 
The mask is 2.15 lbs. without a box (the description says lightweight). I personally would not call it lightweight. It has some weight to it. 
Length laying it down over 2 ft long 
25" 
10.5-11" wide
10" 
Boxed: 3.6 LBS
18" x 13.5" x 8.5"