Abstract Multi-stable structures attract great interest because they possess special energy landscapes with domains of attraction around the stable states. Consequently. multi-stable structures have the potential to achieve prescribed reconfiguration with only a few lightweight actuators (such as shape-memory alloy springs). and do not need constant actuation to be locked at a stable ... https://www.lightemupsequences.com/hot-mega-Esko-Nexus-HeightMaster-Vented-Safety-Helmet-big-savings/