What the Little Button on Your Seat Belt Really Does – A Tiny Feature With a Big Purpose

The shoulder anchor release

Or simply “that thing that moves the belt up and down”

Located at the top of the shoulder harness (on the B-pillar, near the door)

What It Actually Does

Pressing this button allows you to adjust the height of the seat belt’s upper anchor point — so the shoulder strap sits comfortably across your chest.