auxetic

/ɔːkˈsɛtɪk/
adjective
  1. Describing a material that becomes thicker when stretched, rather than thinner.
    • Auxetic foams are used in protective gear because they expand when pulled.
    • The engineers tested an auxetic fabric that stiffens under tension.
    • Auxetic materials have unusual properties that make them useful for shock absorption.
Antonyms
What does "auxetic" mean? | whatsthatwordmean | whatsthatwordmean