# Booster car seat readiness: requirements by product Whether a child is ready to move up to a booster car seat, based on the listed size, age and sitting requirements\. Clek Olli: The child must be 40–57 inches tall and weigh 40–120 pounds; Clek recommends a minimum age of 4 years\. Beyond meeting the stated limits, the child must sit upright without slouching and keep the belt properly positioned\. Britax Skyline 2\-Stage Belt\-Positioning Booster Car Seat: High\-back mode is for children weighing 40–120 lb and measuring 44–63 inches; backless mode is for 48–120 lb and 46–63 inches\. In either mode, the child must be able to remain seated properly\. PEG / Peg Perego Primo Viaggio Flex 120: It is one of the tallest boosters on the market; the highest belt guide is 22 inches, with a 63\-inch height limit and 120\-pound weight limit, and no vehicle head restraint is needed\. A booster without armrests gives a child more freedom to move, so maturity matters for sitting correctly\. Mifold Comfort: Store page features: meets/exceeds US FMVSS 213b; designed for ages 4\+; slim enough for three across in most vehicles; regulated for use during travel; ideal for road trips, carpools, taxis, rental cars, daily use; shoulder belt guide clips and slides\. In hands\-on fit testing, the lap belt with mifold Comfort landed far forward on a smaller child's thighs, outside the recommended range; in a crash the pelvis could move forward without engaging the lap belt\. The reviewer notes about 80% of original mifold fit photos also had unacceptable lap belt fit\. ### 1. [Clek Olli](/products/ucp/anbbaby-com/9829484658974) (sold by anbbaby\.com) Beyond meeting the stated limits, the child must sit upright without slouching and keep the belt properly positioned\. Recall notice: Health Canada and Transport Canada, 2024\-11\-07: [Transport Canada Recall \- 2024716 \- CLEK](https://recalls-rappels.canada.ca/en/alert-recall/transport-canada-recall-2024716-clek) (safety notice, not a recall). The notice may cover only some serial numbers or dates of manufacture, which this listing does not show\. [What a match means](/recall-radar). - Size and age: The child must be 40–57 inches tall and weigh 40–120 pounds; Clek recommends a minimum age of 4 years\. (guide) - Readiness: Beyond meeting the stated limits, the child must sit upright without slouching and keep the belt properly positioned\. (manual) - Belt fit: Consumer Reports warned that rigid LATCH can hold the booster too far forward in some vehicles, potentially producing incorrect lap\-belt fit\. (review) ### 2. [Britax Skyline 2\-Stage Belt\-Positioning Booster Car Seat](/products/ucp/anbbaby-com/6577982505046) (sold by anbbaby\.com) In either mode, the child must be able to remain seated properly\. - Size and age: High\-back mode is for children weighing 40–120 lb and measuring 44–63 inches; backless mode is for 48–120 lb and 46–63 inches\. (guide) - Readiness: In either mode, the child must be able to remain seated properly\. (manual) - Belt fit: The tested six\- and eight\-year\-old children received good high\-back belt positioning, with the shoulder belt centered and lap belt low near the hips and thighs\. The tall belt guide left useful growing room\. (review) ### 3. [PEG / Peg Perego Primo Viaggio Flex 120](/products/ucp/strolleria-com/3782284247114) (sold by strolleria\.com) A booster without armrests gives a child more freedom to move, so maturity matters for sitting correctly\. - Size and age: It is one of the tallest boosters on the market; the highest belt guide is 22 inches, with a 63\-inch height limit and 120\-pound weight limit, and no vehicle head restraint is needed\. (blog) - Readiness: A booster without armrests gives a child more freedom to move, so maturity matters for sitting correctly\. (blog) - Belt fit: - ### 4. [Mifold Comfort](/products/ucp/strolleria-com/8212651343946) (sold by strolleria\.com) Store page features: meets/exceeds US FMVSS 213b; designed for ages 4\+; slim enough for three across in most vehicles; regulated for use during travel; ideal for road trips, carpools, taxis, rental cars, daily use; shoulder belt guide clips and slides\. - Size and age: Store page features: meets/exceeds US FMVSS 213b; designed for ages 4\+; slim enough for three across in most vehicles; regulated for use during travel; ideal for road trips, carpools, taxis, rental cars, daily use; shoulder belt guide clips and slides\. (guide) - Readiness: - - Belt fit: In hands\-on fit testing, the lap belt with mifold Comfort landed far forward on a smaller child's thighs, outside the recommended range; in a crash the pelvis could move forward without engaging the lap belt\. The reviewer notes about 80% of original mifold fit photos also had unacceptable lap belt fit\. (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 2026-10-24T00:03:03.393Z. ## Recall notices About the recall notices above: each matches a model named in a regulator's notice, as the index stood on 2026\-09\-25\. This listing is the brand and model a regulator's notice names\. Two AI models judged it so independently\. It does not mean the unit on sale is from an affected batch, that the store knew, or that the product is illegal where the store sells it; a US recall does not bind an Australian store\. The notice may cover only some serial numbers or dates of manufacture, which a listing does not show\. RoboTrunk never limits or blocks a purchase over a notice; read the notice and decide\. 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. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. 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