--- product_id: 632672341 title: "Grow with You Harness-2-Booster Car Seat, 2-in-1 High Back Booster, Quick-Adjust 5-Point Harness, Mod Black" brand: "britax" price: "¥384768" currency: JPY in_stock: true category: "Britax" url: https://www.desertcart.jp/products/632672341-grow-with-you-harness-2-booster-car-seat-2-in store_origin: JP region: Japan --- # 9-point harness & headrest adjust with 1 hand 2-in-1 booster & harness modes for growing kids High-strength steel frame & patented safety tech Grow with You Harness-2-Booster Car Seat, 2-in-1 High Back Booster, Quick-Adjust 5-Point Harness, Mod Black **Brand:** britax **Price:** ¥384768 **Availability:** ✅ In Stock ## Summary > 🚗 Grow smart, ride safe — the only car seat your kid will ever need! ## Quick Answers - **What is this?** Grow with You Harness-2-Booster Car Seat, 2-in-1 High Back Booster, Quick-Adjust 5-Point Harness, Mod Black by britax - **How much does it cost?** ¥384768 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/632672341-grow-with-you-harness-2-booster-car-seat-2-in) ## Best For - britax enthusiasts ## Why This Product - Trusted britax brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **One-Hand Quick Fit:** Adjust the 9-position harness and headrest with a single hand for perfect comfort and safety. - • **Installation Made Simple:** Quick-push LATCH connectors and color-coded belt guides ensure fast, foolproof setup every time. - • **Built for Ultimate Safety:** High-strength steel frame, crumple zone, and patented V-shaped tether deliver peace of mind on every ride. - • **Effortless Growth Adaptation:** Seamlessly transitions from toddler harness to big kid booster—no rethreading needed. - • **Clean & Chemical-Free Comfort:** Machine-washable, flame-retardant fabrics keep your child fresh and safe without harsh chemicals. ## Overview The Britax Grow with You Harness-2-Booster is a versatile 2-in-1 car seat designed to grow with your child from toddler to big kid. Featuring a quick-adjust 9-point harness and headrest, it eliminates the hassle of rethreading. Its high-strength steel frame and patented safety features provide top-tier protection, while machine-washable, flame-retardant fabrics ensure easy maintenance and chemical-free comfort. Installation is streamlined with quick-push LATCH connectors and color-coded belt guides, making it a trusted choice for busy, safety-conscious parents. ## Description Grow With You™ harness-2-booster grows with your child from toddler to big kid. Safe to machine wash & dry, the removable car seat cover stays looking like-new, mile after mile. No more hand washing or waiting for it to air-dry. Just quick, easy cleanup so you can keep moving. The fabrics are naturally flame-retardant, which means there’s no need for added FR chemicals. Quickly adjust the 9-position harness & headrest using just one hand for the proper fit as your child grows. Once they’re ready to use the seat belt, the 5-point harness tucks away, transitioning to a belt-positioning booster. Color-coded guides help you route the seat belt through the right paths. Choose from plenty of fun colors to match your child’s unique personality. ## Features - DURABLE CAR SEAT: The Britax Grow With You harness-2-booster is a 2-in-1 system - 2-IN-1 BOOSTER SEAT: High back booster easily transitions from forward-facing harness mode to belt-positioning booster mode as your child grows from toddler to big kid - FIND THE PERFECT FIT: Adjust the 9-point harness and headrest with one hand for a good fit with no rethreading ever - INSTALL EASILY: Quick-push LATCH connectors and the color-coded belt guide makes installation quick and easy - BRITAX SAFETY: Features a high-strength steel frame, crumple zone and patented V-shaped tether ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BDSL3ZGC | | Age Range Description | Toddler to Big Kid | | Best Sellers Rank | 611,905 in Toys & Games ( See Top 100 in Toys & Games ) 1,707 in Baby Toys | | Brand Name | Britax | | Colour | Mod Black | | Customer Reviews | 4.1 4.1 out of 5 stars (88) | | Forward Facing Car Seat Minimum Height | 34 Inches | | Forward Facing Maximum Weight | 65 Pounds | | Forward Facing Minimum Weight | 25 Pounds | | Global Trade Identification Number | 00652182742836 | | Harness Type | 5-Point | | Included Components | Car seat cover | | Installation Type | Seat Belt | | Item Dimensions D x W x H | 53.3D x 48.3W x 63.5H centimetres | | Item Type Name | Car Seats | | Item Weight | 10.43 kg | | Manufacturer | Britax USA | | Manufacturer Part Number | S31s319 | | Material Type | Alloy Steel | | Maximum Height Recommendation | 49 Inches | | Maximum Weight Recommendation | 120 Pounds | | Model Number | E1C442T | | Number of Height Positions | 9 | | Orientation | Forward Facing | | UPC | 652182742836 | | Unit Count | 1 Count | ## Product Details - **Brand:** Britax - **Colour:** Mod Black - **Harness type:** 5-Point - **Installation type:** Seat Belt - **Item weight:** 10.43 kg - **Material:** Alloy Steel - **Maximum weight recommendation:** 120 Pounds - **Number of height positions:** 9 - **Orientation:** Forward Facing - **Product dimensions:** 53.3D x 48.3W x 63.5H centimetres ## Images ![Grow with You Harness-2-Booster Car Seat, 2-in-1 High Back Booster, Quick-Adjust 5-Point Harness, Mod Black - Image 1](https://m.media-amazon.com/images/I/71UUZjqc2CL.jpg) ## Frequently Bought Together - Britax Grow with You Harness-2-Booster Car Seat, 2-in-1 High Back Booster, Quick-Adjust 5-Point Harness, Mod Black - Britax One4Life ClickTight All-in-One Car Seat, Eclipse Black - Britax Skyline 2-Stage Belt-Positioning Booster Car Seat, Dusk - Highback and Backless Seat --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/632672341-grow-with-you-harness-2-booster-car-seat-2-in](https://www.desertcart.jp/products/632672341-grow-with-you-harness-2-booster-car-seat-2-in) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-11-15*