# Narrow booster car seats for a small back seat Which booster car seats are narrow enough to fit a small back seat? Chicco GoFit ClearTex Backless Booster Car Seat: Assembled dimensions are 15 inches deep by 17 inches wide by 8\.5 inches high\. Chicco KidFit Zip Air Plus 2\-in\-1 Belt Positioning Booster Car Seat: The store lists assembled dimensions as 20 inches long by 17 inches wide by 26 inches high\. Britax UpNGo: The seat is 17\.1 inches wide \(SpaceSaver design\), intended to leave room for siblings or carpoolers\. PEG Perego Viaggio Flex 120: Its narrow footprint made a difficult three\-across situation work, and despite having no armrests the belt fit was consistently good across the vehicles and seating positions tried\. Maxi\-Cosi RodiFix: Measured by the reviewers: 13\.5 lb, 18\.5 in\. wide at the back in the narrow setting and 21 in\. in the widest, 17 in\. across the front of the base, 12 in\. at the lap belt path, 10 in\. inside at the hips and 16 in\. at the knees, 12 in\. seat pan depth, and shoulder belt guide heights from 14 in\. to 22 in\. ### 1. [Chicco GoFit ClearTex Backless Booster Car Seat](/products/ucp/strolleria-com/8064527597642) (sold by strolleria\.com) Assembled dimensions are 15 inches deep by 17 inches wide by 8\.5 inches high\. - Width: Assembled dimensions are 15 inches deep by 17 inches wide by 8\.5 inches high\. (guide) - Three\-across fit: - - Weight: Product weight is 6 lb\. (guide) - Belt fit: The integrated lap and shoulder belt guides are described as making correct seatbelt placement easy and removing guesswork\. (blog) ### 2. [Chicco KidFit Zip Air Plus 2\-in\-1 Belt Positioning Booster Car Seat](/products/ucp/strolleria-com/8062784569418) (sold by strolleria\.com) The store lists assembled dimensions as 20 inches long by 17 inches wide by 26 inches high\. - Width: The store lists assembled dimensions as 20 inches long by 17 inches wide by 26 inches high\. (guide) - Three\-across fit: - - Weight: The store lists the product weight as 11 lbs\. (guide) - Belt fit: Consumer Reports gave it an overall score of 74, with very good belt fit in both highback and backless modes and excellent ease of use\. (review) ### 3. [Britax UpNGo](/products/ucp/strolleria-com/8085815623754) (sold by strolleria\.com) The seat is 17\.1 inches wide \(SpaceSaver design\), intended to leave room for siblings or carpoolers\. - Width: The seat is 17\.1 inches wide \(SpaceSaver design\), intended to leave room for siblings or carpoolers\. (guide) - Three\-across fit: The maker does not guarantee that three of these seats will fit across every vehicle's back seat\. (listing) - Weight: Sources disagree on seat weight: the store listings give 3\.1 lb, while Consumer Reports gives 5 lb\. (listing) - Belt fit: In the same lab testing it scored 3 out of 5 for backless booster fit and 3 out of 5 for ease of use; highback fit does not apply to this seat\. (review) ### 4. [PEG Perego Viaggio Flex 120](/products/ucp/albeebaby-com/9564437938407) (sold by albeebaby\.com) Its narrow footprint made a difficult three\-across situation work, and despite having no armrests the belt fit was consistently good across the vehicles and seating positions tried\. - Width: - - Three\-across fit: Its narrow footprint made a difficult three\-across situation work, and despite having no armrests the belt fit was consistently good across the vehicles and seating positions tried\. (blog) - Weight: - - Belt fit: Its narrow footprint made a difficult three\-across situation work, and despite having no armrests the belt fit was consistently good across the vehicles and seating positions tried\. (blog) ### 5. [Maxi\-Cosi RodiFix](/products/ucp/megababiesusa-com/7580807266558) (sold by megababiesusa\.com) Measured by the reviewers: 13\.5 lb, 18\.5 in\. wide at the back in the narrow setting and 21 in\. in the widest, 17 in\. across the front of the base, 12 in\. at the lap belt path, 10 in\. inside at the hips and 16 in\. at the knees, 12 in\. seat pan depth, and shoulder belt guide heights from 14 in\. to 22 in\. - Width: Measured by the reviewers: 13\.5 lb, 18\.5 in\. wide at the back in the narrow setting and 21 in\. in the widest, 17 in\. across the front of the base, 12 in\. at the lap belt path, 10 in\. inside at the hips and 16 in\. at the knees, 12 in\. seat pan depth, and shoulder belt guide heights from 14 in\. to 22 in\. (review) - Three\-across fit: - - Weight: Measured by the reviewers: 13\.5 lb, 18\.5 in\. wide at the back in the narrow setting and 21 in\. in the widest, 17 in\. across the front of the base, 12 in\. at the lap belt path, 10 in\. inside at the hips and 16 in\. at the knees, 12 in\. seat pan depth, and shoulder belt guide heights from 14 in\. to 22 in\. (review) - Belt fit: - 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 2026-10-20T07:50:05.001Z. 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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