A floor portion structure that serves as a right foot protecting structure has a tibia pad that is provided at a portion, where a right foot of a vehicle occupant is placed, at a dash panel of a vehicle. In a case in which the tibia pad receives compressive load from the right foot at a time of a vehicle collision, the tibia pad is deformed in a shape that is inclined downwardly to the right such that a right side portion in a vehicle transverse direction at a region of contact with the right foot becomes lower than a left side portion, or is deformed such that the left side portion in the vehicle transverse direction at the region of contact with the right foot generates greater reaction force than the right side portion.

An extendable arm assembly includes an extendable arm structure defining a first axis, a second axis perpendicular to the first axis, and a third axis perpendicular to the first axis and the second axis. The extendable arm structure is configured to be actuated between a stowed configuration and an extended configuration in which the extendable arm structure extends along the first axis. The extendable arm structure includes a main body having a plurality of recesses and a plurality of hinge portions, and a first bladder disposed on the main body delimiting the recesses formed in the main body. The extendable arm assembly is configured to apply vacuum to the recesses to fold the main body along the hinge portions.