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Hercules Prime US

Special Needs & Adaptive booster seat that grows with your child for years

Hercules Prime US

Special Needs & Adaptive booster seat that grows with your child for years

A strong solution is needed for children, young people and adults with physical and neurological disabilities – so that they are always safe in the car.

Hercules Prime US has its great performance when adaptive car seats have become too small or more support is needed when sitting in the car. As a modular positioning booster seat that grows with the user, it offers the familiar functions of our special needs car seats and can be very individually adapted with a large selection of accessories that grow with the user. When more support for the head and upper body is needed, a simple belt system in the car is not enough. For a good, safe sitting position on every journey.

Hercules Prime - see the features!
Order form
Product Registration
Downloads

Seat depth

infinitely adjustable by 6 cm / 2.4", individual adaptation to the growth of the user.

Belt guide

for the 3-point safety belt of the vehicle can be used either on the right or left, the positioning seat can be fastened quickly and easily.

Seat cushion

offers a wide seat surface (38 cm / 15") for large users and makes it easier to get in and out of the seat. Transfer for parents and care givers is also made easier and is easy on the back.

Shoulder width

can be individually adjusted with the shoulder guides (accessory) – also asynchronously if required.

For children, young people and adults who weigh between 40 lbs and 176.4 lbs (18.1 and 80 kg) AND whose height is between 51.1 and 70.9" / 130 and 180 cm. Person must always be secured with vehicle's 3-point safety belt. Integrated 5-point harness provides positioning support only.

Pioneer for rehab car seats - since 1988

For over 30 years, Thomashilfen has been supplying special children with rehab car seats in cooperation with strong partners such as Britax, Römer or RECARO. Today, we also use our know-how to develop our own rehab car seats. All of our many years of experience with the needs of children and parents flow into them.

New features

Swivel and tilting function

Tilting function up to 10° provides more seating comfort for users with weak upper body control. Swivel function facilitates transfer for users and care givers. Booster seat rotates to the right side only.

Shoulder width

Slim and broad users with a shoulder width of 42 to 51 cm / 16.5 to 20.1" sit well supported at all times. The shoulder guides (accessory) grow with the user and are infinitely variable and individually adjustable for each side - even asynchronously.

Backrest height

With the infinitely variable height adjustment of the backrest by 13 cm / 5.1", it is possible to adapt to the user's growth at any time. The head is supported in an optimal position. The large selection of accessories that grow with the user allows for a long service life.
Hercules Prime US meets the needs of children, young people and adults with following clinical pictures, who are not able to sit freely and independently: cerebral palsy, autism, hypotony syndrome of unspecific genesis, muscular dystrophy & different diseases.
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Large becomes small & handy

The adaptive booster seat can be quickly folded to a small, handy size in a few simple steps. This not only facilitates installation in the vehicle. – The positioning booster seat can also be easily transported in small car trunks and can be stowed away to save space.

Will the Hercules Prime US seat fit in my car?
Adjust the positioning booster seat when placed in the vehicle. In maximum back height there should be a distance of at least 5 cm / 2" between the top of head and the roof of the vehicle to ensure that tall users can still sit comfortably.

Product registration

FOR YOUR CHILD‘S CONTINUED SAFETY

Although child restraint systems undergo testing and evaluation, it is possible that a child restraint could be recalled. In case of a recall, we can reach you only if we have your name and address, so please fill in the registration form to be on our recall list. In order to properly register your child restraint system, you will need to provide the model number, serial number and date of manufacture. This information can also be found on a white label located on the back of the child restraint system.

This registration is only applicable to child restraint systems purchased in the United States.

Register your Product now

Examples of functions

5-Punkt-Gurt - Hercules Prime

5-Point-Harness

Soft shoulder pads provide additional support and a good sitting position during the ride – the correct strap length is quickly adjusted on the two buckles.

Anpassbarer Rückenwinkel - Hercules Prime

Back angle

can be adjusted to the backrest with two quick steps – no tools required, just use the red quick release lever.

Leichtes Anschnallen - Hercules Prime

Belt buckle

Shoulder straps can be seperately clicked into the quick-release fastener, which means easier buckling for the carers

Videos

Hercules Prime installation with latch connectors & securing a child
Hercules Prime with Seatfix – Installation
Hercules Prime - Reveal Trailer (US)

Installation - accessories

Installation – crotch strap
Installation – shoulder guides
Installation – shoulder straps
Installation – seatfix adapter
Installation – stabilizing bow
Installation – abduction block
Installation – leg guide
Installation – footrest, foldable
Installation – of the stand
Installation – lateral trunk supports, firm
Installation – lateral trunk supports, swing-away
Installation – Headrest
Installation – upper body guide, firm
Installation – upper body guide, swing-away
Installation – hip belt

Technical data

Dimensions & Weights Hercules Prime US
Seat depth40 - 48 cm / 15.7 - 18.9"
Depth behind crotch strap24 - 38 cm / 9.5 - 15"
Seat width40 cm / 15.7"
Seat to head55 - 80 cm / 21.7 - 31.5"
Back width (seat)45 cm / 17.7"
Shoulder height38 - 60 cm / 15 - 23.6"
Shoulder width with shoulder guide45 cm / 17.7"
Back angle (max.)135°
Seat tilt-in-space (with tilting base 10°)0° / 2,5° / 5° / 7,5° / 10°
Lower leg length (with foot rest)17 - 43 cm / 6.7 - 16.9"
Height of lateral trunk supports (upper edge)20 - 45 cm / 7.9 - 17.7"
Distance lateral trunk supports (max.)41 cm / 16.1"
Max. overall dimensions (w x h x d)52 x 88 x 43 cm / 20.5 x 34.6 x 16.9"
Min. folded dimensions (w x h x d)55 x 21 x 60 cm / 21.7 x 8.3 x 23.6"
Weight of seat12.3 kg / 27.1 lbs
Body height user130 - 180 cm / 51.1 - 70.9"
User weight18.1 - 80 kg / 40 - 176.4 lbs

Accessories

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Hercules Prime US - Special Needs & Adaptive booster seat that grows with your child for years.

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    Car seat Installation Help / Get your car seat inspected

    Whether you’ve just installed a car seat or need help installing or using one, get help at a car seat inspection station near you. Certified technicians will inspect your car seat free of charge, in most cases, and show you how to correctly install and use it:
    https://www.nhtsa.gov/vehicle-safety/car-seats-and-booster-seats#installation-help-inspection

    Find CPS Resources

    Find child occupant protection laws, learn how to get your car seat checked and find answers to your car seat questions in your state or territory:
    https://www.cpsboard.org/car-seat-safety/find-cps-resources-in-your-state

    Looking for educational materials for the Child Passenger Safety Field:

    Hercules Prime US:
    https://www.saferidenews.com/resources/adaptivescrs/hercules-prime

    Manufacturers Alliance for Child Passenger Safety

    In 2007, through the efforts of Safe Kids Worldwide, the Manufacturers Alliance for Child Passenger Safety (MACPS) was formed. Over successive years, this organization has grown, not only in membership size but also activities, and has developed a leadership structure of its own in order to promote child passenger safety.
    More about MACPS

    Downloads – Hercules Prime

    Assembly instructions
    Title Version Size Download
    Brochure - Hercules Prime US (2024-06)     		1.32 MB Download
    Instruction Manual - Hercules Prime US Version EN, left turning (2025-01)     		2.39 MB Download
    Instruction Manual - Hercules Prime US Version EN, right turning (2025-01)     		2.42 MB Download
    Order form - Herucles Prime US     		2026-01 710.66 KB Download