Defender Max Booster

Advanced postural supports, a high-capacity booster design, and extensive adjustability, and delivers enhanced safety and positioning for larger children

Thomashilfen

(Model No. 889)

Product Overview
Starting at
$888.25
$1045
Customize

The SpinLife Difference Includes:

FREE Curbside Delivery

2 Year Limited Warranty

SHIPPING INFORMATION:
Ships in:
2-3 Business Days Details
Expedited Shipping:
GO
2nd Day: $0.00
Overnight: $0.00
SHIPPING INFORMATION
Ships in:
2-3 Business Days Details
Expedited Shipping:
GO
2nd Day: $0.00
Overnight: $0.00
OVERVIEW

Features

  • Includes a 5-point positioning belt with chest clip, height-adjustable headrest, and removable head, trunk, and hip supports
  • Designed for Children 40-120 lbs
  • Highly Adjustable for Growth
  • Customizable with Modular Accessories to fit your child
  • Forward-facing universal restraint system

Key Specs

  • Weight capacity: 120 lbs.
  • Weight: 22 lbs.
View all specs

Manuals, Literature & Videos

Overview

The Defender Reha US Booster is a forward-facing special needs booster seat designed for children weighing 40–120 lbs and measuring 43.4–57 inches in height. Engineered as a Universal Restraint System, it meets and exceeds FMVSS 213 safety standards and is intended for use in vehicles equipped with a standard 3-point lap and shoulder seat belt. 

Built to provide superior postural control, the Defender Reha Booster includes a height-adjustable headrest, removable head, trunk, and hip supports, and a 5-point positioning belt with chest clip and shoulder pads. These features help promote an upright, stable sitting position while improving comfort and confidence during vehicle travel.

What Makes This Different

What sets the Defender Reha US Booster apart is its ability to support larger, growing children who still require positioning assistance beyond what traditional boosters offer. The seat provides a generous adjustable seat width, extended back and shoulder height, and a standard crotch strap extension to accommodate growth and improve pelvic positioning. 

Optional accessories—including swivel base options, short or long footrests with adjustable angles, seat wedge, abduction block, anterior support table, and seat depth extension—allow clinicians and caregivers to customize the seating system for each child’s specific needs and vehicle setup. The narrow overall footprint also helps preserve space for additional passengers or car seats.

Why We Like It

What we like most about the Defender Reha US Booster is how it bridges the gap between traditional boosters and more complex transport seating. It offers high weight capacity, excellent adjustability, and meaningful postural support in a design that remains practical for everyday family travel. The modular accessory system ensures the seat can adapt as the child’s needs evolve.

What to Expect When Ordering

When ordering the Defender Reha US Booster, the base booster seat includes the height-adjustable headrest, 5-point positioning belt with chest clip and shoulder pads, removable positioning supports, cup holder, small crotch pad, and crotch strap extension. Installation is forward-facing only and requires a vehicle with a 3-point lap and shoulder belt. 

Accessories such as swivel bases, footrests, wedges, and additional positioning components are ordered separately to match the child’s seating and mobility requirements. The Defender Reha Booster is not certified for aircraft use. Specifications and pricing are subject to change, and reimbursement is not guaranteed. 

For help with finding a local car seat technician: The National Child Passenger Safety Technician (CPST)

FDA Class II Medical Device. The Defender Reha US Booster is designed to assist children with physical disabilities by providing enhanced safety, positioning, and comfort during vehicle transportation.

More Information on the Defender Max Booster

SPECS

Specs

Seat Width: 12"
Seat Depth: 13"
Product Weight: 21 lbs
Minimum Weight Capacity: 43
Weight Capacity: 120 lbs
Transit Option: Yes
Trunk Support: Involved
Accessories: Head Support
Shoulder Harness Heights: 19.5"
Back Height: 30.5"

Approximate Shipping Dimensions and Weights

Product Weight: 22 lbs.

More Information on the Defender Max Booster

RETURNS & WARRANTY

Return Policy

This item is non-returnable for one of the following reasons:

  • This item is custom-made by the manufacturer to suit your specific needs . Please review all specifications carefully before placing your order.
    • Once production of your custom item has begun – the order is unable to be cancelled.
  • For hygienic safety and per FDA regulations this item is non-returnable, even if unused.
  • Once products are installed, the product is no longer returnable.
  • Items that are purchased as "Open-Box" are non-returnable.
  • Please inspect your product upon delivery. If the product is damaged or is not the correct product, please refuse the delivery. If your item was delivered without a signature and is damaged or incorrect please call SpinLife Customer Service.

If you have questions about this item please call a SpinLife Expert at 1-800-850-0335.

Warranty Information

Limited 2-years warranty

This child restraint is warranted against defective materials and workmanship for

two years from the date of original purchase. Thomashilfen will, at its option, provide

replacement parts for this product or replace this product. Thomashilfen reserves

the right to discontinue or change fabrics, parts, models or products, or to make

substitutions.

WARRANTY LIMITATIONS

This warranty does not include damages which arise from negligence, misuse, or

use not in accordance with this instruction manual. The use of non-Thomashilfen

branded covers, inserts, toys, accessories or tightening devices is not approved by

Thomashilfen. Their use could cause this child restraint to fail federal safety standards

or perform worse in a crash. Their use automatically voids the Thomashilfen warranty.

LIMITATIONS OF DAMAGES

The warranty and remedies as set forth above are exclusive and in lieu of all others,

oral or written, express or implied. In no event will Thomashilfen or the retailer selling

this product be liable to you for any damages, including incidental or consequential

damages, or loss of use arising out of the use or inability to use this product.

More Information on the Defender Max Booster

PARTS

Parts

More Information on the Defender Max Booster

2-3 Business Days

Customize & Buy

Choose One

Booster Mode Seat + Accessories

Swivel base incl. footrest adapter

+$462.60

Foot & Leg Positioning

Help Me Choose

None


Base Options

Help Me Choose

Choose One

Stabilizing bow (if vehicle has no latch)

+$93.60

Lower anchors connection

+$188.10

OPTIONAL ACCESSORIES
- UP TO 20% OFF

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Anterior support, table, black

$292.50 Was $325.00
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Crotch pad, large, black

$74.70 Was $83.00
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Seat wedge, below (+10°), black

$184.50 Was $205.00