Seatbelt assembly including resilient material

An assembly comprising:

• a track;
• a bar supported by the track and slidable relative to the track from a raised position to a lowered position;
• a seatbelt webbing extending over the bar;
• and
• a piston including a piston rod connected to the bar and a piston cylinder, the piston rod and the piston cylinder defining a volume filled with a resilient material;
• the resilient material is a heterogeneous mixture of a liquid and hydrophobic, nanoporous particles.

A vehicle comprising:

• a vehicle body including a pillar;
• a track supported by the pillar;
• a bar supported by the track and slidable relative to the track from a raised position to a lowered position;
• a seatbelt webbing extending over the bar;
• and
• a piston supported by the pillar, the piston including a piston rod connected to the bar and a piston cylinder supported by the pillar, the piston rod and the piston cylinder defining a volume filled with a resilient material;
• the resilient material is a heterogeneous mixture of a liquid and hydrophobic, nanoporous particles.