# Infant car seats with a seat belt tightener or lock\-off Which infant car seats have a belt tightener or lock\-off that holds a vehicle seat belt tight? Cybex Aton G2 Base: The SafeLock belt tensioning system is claimed to give quick, simple and secure installation with vehicle seat belts\. Chicco KeyFit Max ClearTex: The video demonstrates installing the base with either LATCH or the seatbelt but never both, adjusting the recline foot until the bubble is between the lines, connecting the lower anchors and pulling the strap tight, routing the seatbelt and using the lock\-off, and clicking the carrier into the base until it clicks; it advises reading the manuals or consulting a certified technician\. Joie Baby I2320AA: Under 8 lb, anti\-rebound base locks with lower anchors or seat belt, anti\-rebound bar reduces movement, base reclines four positions, can install with or without base; setup was a breeze and lower anchor install quick\. ### 1. [Cybex Aton G2 Base](/products/ucp/megababiesusa-com/9091732439294) (sold by megababiesusa\.com) The SafeLock belt tensioning system is claimed to give quick, simple and secure installation with vehicle seat belts\. - Belt tightening: The SafeLock belt tensioning system is claimed to give quick, simple and secure installation with vehicle seat belts\. (guide) - Child limits: - - Weight: The store lists the base weight as 9\.9 lb\. (guide) ### 2. [Chicco KeyFit Max ClearTex](/products/ucp/strolleria-com/8065093533770) (sold by strolleria\.com) The video demonstrates installing the base with either LATCH or the seatbelt but never both, adjusting the recline foot until the bubble is between the lines, connecting the lower anchors and pulling the strap tight, routing the seatbelt and using the lock\-off, and clicking the carrier into the base until it clicks; it advises reading the manuals or consulting a certified technician\. - Belt tightening: The video demonstrates installing the base with either LATCH or the seatbelt but never both, adjusting the recline foot until the bubble is between the lines, connecting the lower anchors and pulling the strap tight, routing the seatbelt and using the lock\-off, and clicking the carrier into the base until it clicks; it advises reading the manuals or consulting a certified technician\. (review) - Child limits: Use only with a child whose weight is between 4 and 30 pounds and whose height is 32 inches or less\. (manual) - Weight: - ### 3. [Joie Baby I2320AA](/products/ucp/strolleria-com/7897046614090) (sold by strolleria\.com) Under 8 lb, anti\-rebound base locks with lower anchors or seat belt, anti\-rebound bar reduces movement, base reclines four positions, can install with or without base; setup was a breeze and lower anchor install quick\. - Belt tightening: Under 8 lb, anti\-rebound base locks with lower anchors or seat belt, anti\-rebound bar reduces movement, base reclines four positions, can install with or without base; setup was a breeze and lower anchor install quick\. (review) - Child limits: Rear\-facing weight range 4\-30 lb; height under 30 in and top of child’s head must be at least 1 in below top of restraint; replace after moderate or severe crash; expiration 7 years after purchase; FAA approved without base\. (review) - Weight: Rue is 7\.8 lb, described as less than a gallon of milk and 2\-3 lb lighter than non\-lightweight infant seats; can install with base using LATCH, with base using seat belt, or without base using seat belt; FAA compliant\. (review) Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-21T23:30:54.494Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. 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