Case with shock-absorbing impact geometry

A case for a mobile device, comprising:

• a first side with an inside surface and an outside surface opposite to the inside surface;
• a second side with an inside surface and an outside surface opposite to the inside surface;
• a third side with an inside surface and an outside surface opposite to the inside surface;
• and
• a fourth side with an inside surface and an outside surface opposite to the inside surface;
• wherein the inside surface of the first side faces toward the inside surface of the second side;
• wherein the inside surface of the third side faces toward the inside surface of the fourth side;
• wherein the first and second sides are arranged between the third and fourth sides, and the third and fourth sides are arranged between the first and second sides, so that the first, second, third, and fourth sides form at least part of a frame configured to surround a periphery of the mobile device when the mobile device is arranged inside the case;
• wherein at least one of the inside surfaces of the first, second, third, and fourth sides includes triangular protrusions that have a triangular cross section and extend toward the inside of the case, so that an apex of each of the triangular protrusions contacts the mobile device when it is arranged inside the case.