Stretch Armstrong keeps best at room temperature. Stretch Armstrong is made of latex rubber filled with gelled corn syrup, which allows it to retain shape for a short time before shrinking to its original shape. An estimated 67 different versions from Japan, Germany, Italy, France, Australia, and other countries released Stretch Armstrong variations between 1976 and the 1990s. The last two were filled with a granular solid in place of the viscous liquid found in the other figures. A vacuum pump, which attached to the heads of these figures, removed the air from within, which "froze" the toy in its stretched position.
Kenner Products of them centered on unique action features, similar to those popularized by Mattel's competing "Masters of the Universe" toy line as well as Kenner's earlier Super Powers toy line. This idea of basing a toy line on well-known characters but then coming up with original designs that were not based on any published storylines represented a major shift in the design approach to action figure toy lines at the time. In previous years, one major approach to producing toy lines was to base them closely on popular, well-known characters from properties like "Star Wars", Marvel Comics, or DC Comics. The