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{config.cms_name} Home / Products / R129 standard / i-Size / I-Size Baby Car Seat / ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm
JIANGSU HAPPY BABY SAFETY SEAT CO., LTD.
I-Size Baby Car Seat
  • ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm
  • ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm
  • ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm
  • ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm
  • ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm
  • ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm
  • ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm
  • ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm

HB338
ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm

The HB338 ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm is a child car seat that combines multiple functions, high safety, and ultimate convenience. This seat fully complies with the latest European safety standard R129/03 i-Size certification, and its height based design concept ensures worry-free protection from newborns to older children (40-150cm).Its advantage lies in the 360 ° rotation function, which allows parents to easily carry their children in and out without any effort, greatly improving the convenience of daily use.
HB338 adopts injection molding process, providing a sturdy frame for the seat. The built-in side collision protection system provides comprehensive safety protection for children.  The ISOFIX+Top Tether dual fixing system equipped on the seat forms a stable connection, minimizing the risk of installation errors. In order to adapt to the rapid growth of children, HB338 provides 11 levels of headrest height adjustment and 6 levels of seat belt height adjustment, ensuring that the seat always perfectly fits the child's body. In addition, the tilt adjustment of four gears in the forward and rearward directions allows children to find the most comfortable riding posture in any situation.

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Category Details
Core Configuration Equipped with ISOFIX + Top Tether
360° Rotation
Contoured and flat base
Rearward Facing Requirement Child height range: 40cm-105cm
Child weight limit: ≤22.6kg
Forward Facing Requirement (1) Child height range: 76cm-105cm
Child weight limit: ≤22.6kg
Forward Facing Requirement (2) Child height range: 100cm-150cm
Production Process Injection mould making
Safety Protection Side impact protection system
Integral 5-point harness system
Adjustment Functions 6 harness heights (adjustable to children’s height)
11 height positions for headrest adjustment
4 one-hand operated seat reclining positions (for forward facing)
4 one-hand operated seat reclining positions (for rearward facing)
Packaging Specification 1 piece per carton
220 pieces per 20-foot general purpose container (20GP)
600 pieces per 40-foot high cube container (40HQ)
Safety Compliance Meets European New Safety Standard R129/03: i-Size

The Role of the Top Tether: A Second Anchor Point That Changes How the Seat Behaves in a Crash

A support leg braces the seat against the vehicle floor. A top tether does something different: it anchors the upper back of the seat shell to a fixed point behind the seating position, usually on the parcel shelf, the seat back frame, or a dedicated floor-mounted rail depending on the vehicle. Where the two systems overlap is the goal — limiting how far the seat can pitch forward on hard braking — but they reach it through different geometry, which is why some markets favor one over the other and why this seat exists as a distinct configuration rather than a simple accessory swap.

Why it matters for the buyer

A top tether pulls tension from above the seat rather than pushing resistance from below it, which is the configuration many North American and a growing number of European buyers specifically search for by name — making this variant relevant to a different set of storefront search terms than a support-leg model.

Adjustability at a Glance

11
Headrest positions

Fine height steps that track a child's growth across several years rather than a few fixed stages.

8
Recline angles combined

Four rearward and four forward-facing angles, each switchable with one hand while the child stays buckled in.

6
Harness heights

Moves together with the headrest so the shoulder strap path stays correct at every stage.

22.6kg
Rear/forward weight limit

Noticeably above the roughly 18kg limit commonly seen on comparable seats in this height bracket.

Top Tether or Support Leg — Which Fits the Target Market?

Both fixing systems are available across this product line built on the same 40-150cm i-Size platform. The comparison below is meant to help a buyer choose the right configuration for a specific storefront or region rather than to declare one universally better than the other.

HB338 — ISOFIX + Top Tether
Anchor geometry: Upper tension strap to a rear anchor point
Weight ceiling: Up to 22.6kg on rear and forward-facing stages
Container yield: 220 pcs per 20GP, 600 pcs per 40HQ
Market fit: Preferred terminology in North America; increasingly searched in parts of Europe
Vehicle requirement: A rear tether anchor point (common on most post-2010 vehicles)
VS
HB336 — ISOFIX + Support Leg
Anchor geometry: Telescopic leg braced against the vehicle floor
Weight ceiling: Up to 21.4kg on rear and forward-facing stages
Container yield: 200 pcs per 20GP, 490 pcs per 40HQ
Market fit: Common default terminology across much of continental Europe
Vehicle requirement: Sufficient floor clearance for the leg's base plate

Fitting the ISOFIX + Top Tether System, Step by Step

1
Engage ISOFIX arms
Extend and click both connectors into the lower vehicle anchors until the indicator confirms a full lock.
2
Push flush to the seat back
Remove any gap between the base and the vehicle bench before attaching the tether.
3
Locate the tether anchor
Identify the labeled anchor point on the parcel shelf, seat back, or floor rail, depending on the vehicle.
4
Clip and tension the strap
Route the tether over or around the seat back as instructed, then tighten until the webbing sits snug with minimal slack.
5
Set direction, recline, harness
Rotate to the correct facing direction for the child's height, then match recline and harness height to the child.

Configuration Summary for Sourcing Conversations

Attribute HB338 detail
Fixing method ISOFIX lower connectors + top tether strap
Rear-facing weight limit ≤22.6kg, height range 40–105cm
Forward-facing weight limit ≤22.6kg up to 105cm, extending to 150cm by height thereafter
Shell construction Injection-molded frame with integrated side-impact wings
Harness type Integral five-point system, 6 height positions
Recline mechanism One-hand adjustment, 4 rearward + 4 forward angles
Certification UNECE R129/03 (i-Size)
Quality system ISO 9001:2008 certified production

Freight Efficiency for This Configuration

The top tether variant's slightly more compact rear profile allows for a small improvement in per-container unit count compared with the support-leg configuration, which is worth factoring into a landed-cost comparison when the two variants are being weighed against each other for the same market.

220 / 20GP
600 / 40HQ
20-foot general purpose container 40-foot high cube container

Figures reflect one piece packed per carton, consistent with the standard export packing configuration for this model.

What Stands Behind the Certification Label

A
In-house molding
Shell and structural components are produced on site rather than sourced from third-party molders.
B
ISO 9001:2008 system
Governs incoming material checks, in-process inspection, and final testing prior to packing.
C
~200-person team
Spanning design, tooling, stitching, and quality control functions under one roof.
D
R129/03 type approval
Independent testing against the current i-Size regulation, including side-impact criteria.
E
12-hour reply window
Standard response time for inquiries submitted on working days.

Keeping the Seat in Good Condition Between Uses

Fabric cover

Remove and wash according to the care label rather than by general habit — the layered foam beneath is shaped to the cover and can lose fit if machine-dried on high heat.

Harness webbing

Spot-clean with a damp cloth instead of submerging or machine washing, since repeated soaking can gradually affect webbing strength over years of use.

Tether strap and hardware

Check the tether strap and buckle periodically for fraying near the anchor clip, which sees more repeated tension cycles than most other parts of the seat.

Shell and base

Wipe with a damp cloth and mild soap; avoid solvent-based cleaners, which can dull the injection-molded surface finish over time.

Where This Configuration Is Commonly Requested

Top tether anchoring is the default expectation in several export markets, and R129/03 approval carries across a wide group of contracting countries under the shared UNECE framework, which reduces the need for separate testing when a listing expands into a neighboring market.

United States (with a compatible LATCH-style anchor) Canada EU-27 United Kingdom Australia (region-specific rules apply)

Local anchor hardware and labeling requirements differ by country; confirming destination-market rules before finalizing a listing is still recommended.

Common Questions About the Top Tether Configuration

Does every vehicle have a top tether anchor point?

Most vehicles manufactured in the last fifteen years include one, though its location varies — checking the vehicle's own manual is the fastest way to confirm before purchase.

Can the tether strap length be adjusted for different vehicle shapes?

Yes, the strap includes a length adjuster so it can be tensioned correctly whether the anchor point sits close to the seat back or further away on a parcel shelf.

Is the tether strap required, or is it optional reinforcement?

For this configuration it is a required part of the certified installation method, not an optional add-on, since the type approval was tested with the tether engaged.

How does the higher 22.6kg weight limit affect the usable age range?

It generally extends how long a child can stay in the harnessed stages before a transition is needed, though the height reading on the seat's own indicator should always take priority over a weight estimate.

Can this configuration be produced with a different tether strap color or webbing pattern?

Webbing color and harness pad pattern are among the more commonly requested customization points and can typically be discussed alongside a sample order.

What documentation is provided for import clearance?

The R129/03 type-approval report and e-mark certificate are the standard documents supplied alongside a production order to support customs and retail listing requirements.

Weighing the top tether variant against the support-leg model for a specific market? Send the target country and expected order volume through the contact form on this page, and the applicable spec sheet, sample terms, and container-load pricing will be sent back for review, typically within twelve working hours.

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JIANGSU HAPPY BABY SAFETY SEAT CO., LTD.
JIANGSU HAPPY BABY SAFETY SEAT CO., LTD. specializes in we hope to be not only the China ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm Suppliers and Custom ISOFIX + top tether 360 Rotation Rearward/Forward Facing I-Size Baby Car Seat 40-150cm Factory, but also the trusted guardians of families. Child safety is not merely a set of standards or a certification, but a responsibility and commitment. The birth of every chair is an understanding of the family and a reverence for life. We hope to provide products that are safe, comfortable and design-oriented for families around the world through continuous research and development and innovation, so that parents' peace of mind can go hand in hand with children's smiles.
Certificate Of Honor
  • Certificate OfRegistration
  • Invention Patent Certificate
  • Q00271736-1
  • Q00271810-1
  • E8-129
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