The CommuteMate Seat Belt Strap Adjuster is a sliding clip that asdjusts the shoulder strap off the neck. 2-Pack Sliding clip adjusts a seat belt shoulder strap off of the neck and provides travel comfort for both drivers and passengers. Installs with a snap! The Seat Strap Adjuster is made to work with a three point seatbelt, making the shoulder strap maintain an upright position in case of impact. Helps maintain upright position upon impact (Crash Impact Tested) A great way to make seatbelt use easier for children!