Cellular open-pored metallic structures represent a composite material having unique properties. Their low weight, good thermal conductivity, permeability and interpenetrability, their high porosity of up to 98 % and good energy absorption capacity establish these structures as extremely interesting for light-weight constructions. The energy damping properties, in particular, promise interesting applications as safety features for, for example, the automotive branch or the transport sector. The design of structures inspired by nature and manufactured using precision casting falls within the scope of the priority program SPP1420. In drop-tests, the cellular structure of the pomelo’s fruit-husk exhibits excellent energy dissipation during the fruit’s impact. As investigations show, evidence suggests that this property is derived from a particular hierarchical arrangement of the existing building-blocks. Here, the pomelo’s fruit-husk exhibits at least seven hierarchical levels. By rendering the individual hierarchical levels or combinations of hierarchies as engineered, open-pored metal foams; as composite materials possessing excellent energy damping, simultaneously promises low material input together with the associated light-weight properties.