---
product_id: 501212102
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: "¥220830"
currency: JPY
in_stock: true
category: "Britax"
url: https://www.desertcart.jp/products/501212102-grow-with-you-harness-2-booster-car-seat-2-in
store_origin: JP
region: Japan
---

# 9-point harness & headrest adjust w/1 hand 2-in-1 harness to booster seat system High-strength steel frame & SafeCell 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:** ¥220830
**Availability:** ✅ In Stock

## Summary

> 🚗 Grow smart, ride safe — the only seat your kiddo 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?** ¥220830 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/501212102-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

- • **Comfort Meets Convenience:** Dual cup holders, two recline positions, and stay-put harness pads ensure every ride is smooth and stylish.
- • **Quick & Secure Installation:** Premium quick-push LATCH connectors and color-coded belt guides make setup a breeze, saving you time and stress.
- • **Effortless Growth Adaptation:** Seamlessly transitions from 5-point harness to belt-positioning booster as your child grows—no rethreading needed.
- • **Unmatched Safety Engineering:** Built with a high-strength steel frame, crumple zone, and patented V-shaped tether for industry-leading crash protection.
- • **Easy Maintenance for Busy Parents:** Machine-washable, flame-retardant cover keeps the seat fresh and clean without hassle.

## 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 effortlessly converts from a forward-facing 5-point harness seat to a belt-positioning booster. Engineered with a high-strength steel frame, SafeCell technology, and a patented V-shaped tether, it offers superior crash protection. Installation is simplified with quick-push LATCH connectors and color-coded belt guides. Additional perks include two recline positions, dual cup holders, stay-put harness pads, and a machine-washable, flame-retardant cover—combining safety, comfort, and convenience for modern families.

## Description

Find a car seat that grows with your child from toddler to big kid age with the Britax Grow With You(TM) harness-2-booster car seat. This high back booster seat starts as a 5-point harness car seat and converts into a belt-positioning booster that works with your car's seat belt. Installing this toddler car seat is simple using the premium, quick-push LATCH connectors. Quickly adjust the 9-position harness and 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 the seat to a belt-positioning booster. The color-coded belt guide helps you and your child route the seat belt through the right paths for a secure fit. This forward facing car seat is made with naturally flame-retardant fabrics and foam that are safe to machine wash and dry. SafeCell(R) Technology in the base acts as a crumple zone for additional protection for your growing child. This booster features armrests, 2 cup holders and stay-put harness pads, so even big kids enjoy the ride.

## 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, a crumple zone, a patented V-shaped tether, and two layers of energy management
- PREMIUM COMFORT: The padding and fabrics offer superior comfort and style, while the stay-put harness pads keep your child’s neck from rubbing against the harness strap
- SIP ON THE GO: The 2 cup holders offer convenient spots for your child's drinks and snacks
- TWO RECLINE POSITIONS: Helps you find the most comfortable fit for your child and the best fit for your vehicle
- CONVENIENT BUCKLE: The 2-position buckle accommodates your growing child and flips forward for easy loading
- MACHINE-WASHABLE COVER: The removable cover is washer-and-dryer friendly for easy cleanup

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BDSL3ZGC |
| Age Range Description | Toddler to Big Kid |
| Best Sellers Rank | #5,531 in Baby ( See Top 100 in Baby ) #25 in Child Safety Booster Car Seats |
| Brand | Britax |
| Color | Mod Black |
| Customer Reviews | 4.0 4.0 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 |
| Installation Type | Seat Belt |
| Item Dimensions D x W x H | 21"D x 19"W x 25"H |
| Item Type Name | Car Seats |
| Item Weight | 23 pounds |
| Manufacturer | Britax USA |
| Manufacturer Warranty Description | 1 Year Limited Warranty |
| Material Type | Polypropylene |
| Maximum Height Recommended | 49 inches |
| Maximum Weight Recommendation | 120 pounds |
| Model Number | E1C442T |
| Number of Height Positions | 9 |
| Orientation | Forward Facing |
| Part Number | S31s319 |
| UPC | 652182742836 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Britax
- **Color:** Mod Black
- **Installation Type:** Seat Belt
- **Material:** Polypropylene
- **Orientation:** Forward Facing

## 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)

## Available Options

This product comes in different **Color, Style** options.

## 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

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-21*