Holmbergs Safety Solutions

Holmbergs RollFix™ solves the No. 1 problem with car seats

Too much slack in child car seat straps is a major problem in the child safety industry today. When there is too much slack, it puts children in dangerous situations.

Enter Holmbergs RollFix™. After a parent buckles in their child and manually tightens the harness straps, Holmbergs RollFix™ locks the straps in place and prevents them from becoming slack, securing the child in their seat. Holmbergs RollFix™ also gently and continuously pulls on the straps to help take up any excess slack.

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Holmbergs RollFix™

Because there’s no slacking off when it comes to safety

Holmbergs RollFix™ is a slack reduction system. It continuously pulls on the harness straps so they don’t become loose and any excess slack is reduced. Sometimes parents do up a harness without fully tightening it, leaving it slack. When children fidget and move, they also create slack in the harness. This can lead to dangerous situations. Trust Holmbergs RollFix™ to prevent harness straps from becoming loose.

A life-saving innovation

Holmbergs saw the problem of excess slack in child car seats and decided to go ahead and solve it, like a world leader in safety should. We know parents do their best when buckling up their children, but slack still sneaks in and loosens the straps.

With Holmbergs RollFix™, that’s a problem of the past.

Innovative safety

Holmbergs RollFix™

Our slack reducing safety solution works out-of-sight to keep children safer in their car seats.

Placed within the shell of the car seat, the Holmbergs RollFix™ retractors prevent the straps from becoming loose, making road trips safer for kids.

The specially designed retractors and bowden cables are the workhorses of the Holmbergs RollFix™ safety solution. When the child’s harness is unbuckled, the straps can move in both directions. Once the harness is buckled, the straps move only in one direction to keep the child snug in the seat.

RollFix retractors and cables

Our buckles and webbing are the heart and soul of our harness systems. Made and sewn with top quality materials in our own production plants and rigorously tested, they work together with Holmbergs RollFix™ to keep children secure while traveling.

RollFix buckle and webbing
Salt spray test at buckles
Testing for perfection

Proven safety

At Holmbergs, we go above and beyond when it comes to testing. Our suppliers test all the parts they send to us, and then we retest them, and when we’ve assembled the safety solution, we retest it as a whole. Then we have third-party testers verify our findings.

Because lives depend on it.

Testing & quality

Safety services

Holmbergs safety services


3d models

Get an up close look at Holmbergs RollFix™ from anywhere in the world with our 3d models. Interested? Contact us and we will send you the Holmbergs RollFix™ files, so you can view the model on your computer in three dimensions.
Holmbergs RollFix Communication Manual

Marketing kits

We know Holmbergs RollFix™ inside out. We know the benefits to the end users and the value it provides. If you need any help with your marketing efforts, contact us and receive our Holmbergs RollFix™ marketing kits and take advantage of our expertise.
Design meeting for developing new seat belt

Global representation

With sales and engineering team members located in Europe, Asia and North America, Holmbergs covers the entire globe. If you want to know more about Holmbergs RollFix™, we can answer your questions no matter where you are.

Design guidance

To help you incorporate Holmbergs RollFix™ into the design of your child car seat, we’ve developed design guidelines. Save time and money by taking advantage of Holmbergs expertise.
BeSafe with Holmbergs RollFix

Actively keeping children safe

One of the things we love most about working with BeSafe is their willingness to try new, innovative safety solutions. Like when BeSafe was the first of Holmbergs’ safety partners to implement Holmbergs RollFix™ into a child car seat, the BeSafe Active Retract Harness™.

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Jane Groowy seat with Holmbergs harness system and RollFix

Innovating to save lives

In their quest to create the safest car seats for children, Jané Concord is always willing to try new innovations. One of their newest seats, the Ikonic R Car Seat, uses Holmbergs RollFix technology to help parents and caregivers ensure their babies and infants are fitted snugly into the seat.

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Send us a message

We’re happy to answer your questions.

Stefan Svensson

Stefan Svensson

Sales Director – Europe and Asia


+46 70 548 43 23

Daniel Angerer

Daniel Angerer

Sales Manager – Europe


+43 664 5394 431

Tim Cathrine

Tim Cathrine

Sales Director – North America


+ 1 317 674 2836

Jim Gold

Jim Gould

Key Account Manager – North America


+1 317 650 1142

Tony Hong

Tony Hong

Account Manager & Business Development China


+86 1386 2606 212

Sara Zhang

Sara Zhang

Account Manager – South China


+86 138 2330 5075

Frequently asked questions


Please read the frequently asked questions about Holmbergs RollFix™ to learn even more about the system.

Have more questions? Please contact us.

Holmbergs RollFix™ is crash-tested in compliance with the Economic Commission for Europe regulation ECE R129 (i-Size).

It is approved by all applicable European authorities.

Holmbergs RollFix™ is available with our Saga buckle.

540 grams.

A traditional 5-point safety belt harness needs to be tightened firmly by pulling the central adjuster strap positioned between the knees of the child. Holmergs RollFix™ does not have a central adjuster or a strap to tighten the harness. Instead, there is an advanced retractor system inside the seat that helps parents tighten the straps with a ticking sound they can use to determine when the straps are tight enough. Holmbergs RollFix™ prevents the straps from being extended during the ride, keeping them tight for the duration of the ride. The system also gently and continuously pulls on the straps to help reduce excess slack.

There are two integrated retractors in the child car seat that prevent the straps from becoming slack. When the buckle is open and folded down to its most forward position the straps are free to move in and out. When the buckle is raised for fastening, the straps are prevented from moving out, but will continue to move in until the harness is tight enough. For a proper fit, parents should pull the shoulder straps upwards towards the child’s shoulders and listen for the clicking sound. When the clicking sound stops and they can no longer pull the straps up, they are tight enough. The Holmbergs RollFix™ retractors also gently and continuously pull on the straps to help reduce any excess slack.

The safety harness straps cannot be extended in the same way as a car seat belt. So, Holmbergs RollFix™ makes it much harder for the child to climb out of.

No. Once the buckle is in an upraised position, the straps can only be pulled inward toward the back of the child car seat. The child is restrained in the seat as long as the buckle is not open and folded down to its most forward position.

No. Holmbergs RollFix™ is not automatic. When putting a child into the car seat, a parent has to pull the shoulder straps upward toward the back of the seat as much as they will go. Once the straps are properly fitted, the Holmbergs RollFix™ retractors prevent the straps from becoming loose.

The Holmbergs RollFix™ retractors also gently and continuously pull on the shoulder straps to help reduce any excess slack. This pulling action is from a spring mechanism and is not motorized. It may help reduce small amounts of slack in the straps, but there is no guarantee that the mechanism can roll up a large amount of slack.

Parents should always check to confirm there is a proper fit around the hips and shoulders of the child and tighten the straps manually as much as they can.

The Holmbergs RollFix™ retractors emit a small ticking sound for every step the harness is tightened. A parent will hear the ticking sound when they are pulling the shoulder straps up toward the back of the seat to tighten the straps.

No. As in all car seats, thick outer clothing makes it difficult to get the safety harness properly tightened for a secure fit. Outer winter clothing should not be worn by a child while sitting in any car seat.