“…Auxetic foams also possess peculiar characteristics like the synclastic (dome-shaped) curvature (Figure . 15) [15,19], reduction of vibration transmissibility (Figure . 16) [112], acoustic absorption (Figure . 17) [108,[112][113][114][115][116][117][118] and variable permeability (Figure . 18) [82,119] Auxetic foams could also be made reversible, which means that the foams can be converted to their original state by a reforming process, i.e., they exhibit shape memory. (Figure . 19) [36,43,44,54,67,74,120,121].…”