Lockoffs: What You Need to Know & Which Car Seats Have Them

CSB’s Carseat Lockoff Guide

As LATCH weight limits continue to shrink due to a combination of heavier car seats and federal standards, more car seats require installation using the seatbelt once the child hits a certain weight. The problem with seatbelt installations is that most parents have no idea how to lock the seatbelts in their vehicle in order to properly install a carseat or infant seat base. Ask the average parent what a switchable retractor is and you’ll probably get a blank stare in response.

This is why every car seat in North America should come with a built-in lockoff! If you are installing with a seatbelt instead of lower LATCH anchors and your carseat has a lockoff device – use it and you will never have to worry about understanding pre-crash locking features on vehicle restraint systems.

Function of built-in lockoff device: A lockoff device can serve more than one function but its main purpose is to cinch or clamp the seatbelt in such a way that it cannot loosen and your tight car seat installation stays tight!  

2023 Car Seats With Lockoff(s)

Rear-Facing Infant Seats
Baby Jogger City GO 2City GO AIR
Britax B-Safe Gen2 | B-Safe Gen2 FlexFit | B-Safe FlexFit+ | Endeavours | B-Safe Ultra
Chicco KeyFit | KeyFit 30 | KeyFit 35
Chicco Fit2
Clek Liing
Evenflo LiteMax | LiteMax DLXSecureMax Infant
Graco SnugRide SnugFit 35 LX | SnugRide SnugFit 35 DLX | SnugRide SnugFit 35 Elite | Premier SnugRide SnugFit 35 XT
Graco SnugRide SnugLock (all models)
Maxi-Cosi Coral XP | Mico XP Max
Nuna Pipa | Pipa Lite | Pipa Lite lx | Pipa Lite rx | Pipa Lite r | Pipa rx
Orbit Baby G5 Infant Seat
Peg-Perego Primo Viaggio 4-35 | Primo Viaggio Lounge | Primo Viaggio Nido
UPPAbaby Mesa | Mesa V2
Convertible Seats
Baby Jogger City Turn
Britax AllegianceEmblem
Britax  ClickTight convertibles (all models)
Britax One4Life ClickTight All-in-One
Chicco NextFit SportNextFit Zip | NextFit Zip Max ClearTex | NextFit Zip Max Air
Chicco Fit4 | Fit4 Adapt
Chicco OneFit ClearTex All-in-One
Clek Foonf | Fllo
Graco 4Ever DLX* | 4Ever DLX SnugLock | 4Ever Extend2Fit* | 4Ever featuring TrueShield* | 4Ever featuring Safety Surround*
Graco Turn2Me Revolving 3-in-1
Graco SlimFit3 LX* | True3Fit LX*
Graco TrioGrow SnugLock | TrioGrow SnugLock LX
Maxi-Cosi Magellan XP | Magellan XP Max
*forward-facing only lockoff
Forward-Facing Combination Seats
Britax Grow With You ClickTight | Grow With You ClickTight Plus
Chicco MyFit | MyFit Zip | MyFit Zip Air
Graco Nautilus SnugLock | Nautilus SnugLock Grow
www.CarseatBlog.com ©2023 All Rights Reserved

Lockoffs on Infant Seat Bases

There are different types of lockoffs that require different routing so make sure you are following the directions that came with your carseat. Never assume anything. Below we discuss the two most common types of lockoff systems for infant seat bases.

Lockoff just for shoulder belt portion of the seatbelt

  • Bases with these types of lockoffs will have a lockoff on each side of the base but you only use one lockoff, on the side where the shoulder belt goes up to the retractor. Do NOT use the lockoff on the buckle side.

keyfit base lockoff


Two lockoffs on base but only use one of them!

Single lockoff device

  • clamps both sections of the seatbelt (lap belt and shoulder belt)

Graco SR35 lockoff



Convertible seats with lockoffs may have them for both rear-facing and forward-facing or just for forward-facing. 

Britax Allegiance and Emblem lockoffs


Clek Foonf & Fllo lockoffs (different types of lockoffs for RF & FF beltpaths)

Clek Fllo FF lockoff Clek Fllo RF lockoffs

Graco 4Ever DLX lockoff (only for forward-facing installations)

Forward-Facing Combination Seats Lockoffs

Chicco MyFitLockoff cinches just the shoulder belt portion of the seatbelt (this lockoff design can also be found on all current NextFit, Fit4 and OneFit models)

ClickTight Technology (available on certain Britax models): The ClickTight compartment acts as a lockoff too!

Britax Frontier 90 - Desert PalmBritax Advocate CT - open CT compartment stock


  1. Margaret June 15, 2016
  2. Kelly May 27, 2016
    • Kecia May 27, 2016
  3. Randie March 1, 2016
  4. Vanessa Aguayo January 27, 2016
  5. Liz July 29, 2015
    • Erin August 3, 2015
  6. Jen Longson June 26, 2015
    • Kecia June 27, 2015
  7. Amy May 26, 2015
    • Kelly May 27, 2016
  8. Kristen April 28, 2015
    • Julie April 28, 2015
      • Megan November 28, 2016
        • Kecia November 28, 2016
        • Mikalah January 25, 2017
  9. Heather Smith February 4, 2015
    • Kecia February 5, 2015
  10. Lillian Cannon January 28, 2015
  11. Julie Abel-Gregory January 26, 2015

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.