A protective helmet includes an outer layer and an inner layer interconnected by multiple connectors under tension along their longitudinal axis. The connectors absorb energy from an impact force by resisting further tension along their longitudinal axis and allow the outer layer and inner layer to move relative to each other. In protecting the head of a user, the helmet reduces the amount of impact force experienced, reduces the change in momentum or position of the head and neck, reduces head and neck loads and reduces the amount of linear and rotational acceleration. The helmet can be used in numerous applications and environments, including for participants in sports, including football, baseball, lacrosse, racing, skiing, for commercial activities, including construction, and for military personnel, including pilots and soldiers.