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.
Latex mask the excess is poured out. After the latex rubber has dried inside the mold, it can be peeled out and painted as desired. What comes out of the mold is now the 'positive' version of the latex mask. In complex transformations, both the original, unaltered positive mold and the altered, character molds may be used to achieve high levels of fit and fidelity. In such cases, thin 'takes' of both the changed and original may have the void between them filled with liquid latex so that the interior fits the original wearer and the exterior matches the desired character precisely.