泡沫 (foam/bubbles) +
塑料 (plastic) = plastic full of bubbles = foam plastic.
泡沫 on its own can also mean 'bubble' in an economic sense (
经济泡沫 = economic bubble). The word
塑料 appears in many compound materials terms:
塑料袋 (plastic bag),
塑料瓶 (plastic bottle).
