Such a cute costume.  I took the advice of other reviews and bought a size bigger.  They were right!  The mask wasn't cheaply made like other reviews said.  The costume is a lightweight fabric and perfect to wear for Marvel Live that came to Houston.  We're having 100+ degree weather and my son wasn't overheated!  Tge mask is made of a tough plastic.  The colors are brighter than shown in the picture.  The tail stayed on well even though its velcroed on.  The back velcro too.  I made sure my son had lightweight clothes on underneath.  I wouldn't wear it without clothes because the back velcros from the waist up.