Frequently Asked Questions

You still have questions about a Restube or our company? Then this is exactly the place to look!


Restube is a product which provides more water safety in places where lifejackets aren´t usually used. In a little more detail: The Restube is an inflatable backup when you’re in water. Small and light, your Restube is always there. Easily attached around your waist or on a harness and off you go. When necessary, pull hard on the trigger and the float inflates. Now you have time. Perfect for use in a lake or in the ocean. Reusable through replacing the gas cartridge.

The company’s headquarters and manufacturing facilities are located in Berghausen, near Karlsruhe, Germany. This is where Restubes are developed and produced.

Restubes can be bought in many sports stores. If you like the idea of RESTUBE, you may endorse us as a young company – just ask your local dealer for RESTUBE. You can also buy Restubes directly in our online shop.

You can find a detailed instruction how to pack a Restube in our blog. Click here!


In 2012, the startup RESTUBE was founded by two mechanical engineering graduates from Karlsruhe who have always loved water sports. While kitesurfing in open waters, Christopher Fuhrhop found himself in a tricky situation in which he wished he had some small, lightweight, and personal water rescue equipment.

The rest is history: Both he and Marius Kunkis wrote their theses on the new product and were promptly awarded by the federal government and recieved the EU “Exist” schollartship. Many successes followed and soon they were finalists for the founder competition sponsored by the German magazine Wirtschaftswoche, the James Dyson Award, the ISPO Brand New Award, and awarded with the ISPO Gold Award 2014/15 and 2016/17.”

The incentive for RESTUBE was from being in a critical situation in the water. A fall while doing water sports and the disorientation and panic that comes with it. How can such a situation be avoided? Founder Christopher Fuhrhop came across this question when he had experienced such a situation.

“It all started as an idea during my studies, and I couldn’t get rid of it!” Studying mechanical engineering suddenly made sense. Soon, a team formed between Marius Kunkis, Christian Schwarzkopf, and Christopher Fuhrhop. The idea grew with support from the University of Karlsruhe and many others who believed in the project.

Since fall 2010, full-time work lead to a small and handy water rescue system. “RESTUBE sports” was released in the summer of 2012. The product was awarded the “brand new award” at the sports trade fair ISPO as well as by the federal government. RESTUBE was named one of the best startups by Wirtschaftswoche and won the James Dyson Award. The rest is history: From long distance swimmer Bruno Baumgartner, windsurfer Florian Jung, professional stand up paddler Sonni Hönscheid to kitesurf instructors and lifeguards at DLRG (the German lifesaving organization) – the simple idea created freedom and enthusiasm. And the RESTUBE team continues to grow.

In 2014, two versions were available (classic and sports). Since 2015, four different versions are now available. Three for self-rescue (basic, classic, sports) and one for rescuing others (lifeguard). The “basic” has the fundamental functions and is therefore perfect for all water activities, e.g., with the family, as backup on a boat, or while fishing and kayaking. The “classic” can be worn vertically and has almost no drag while swimming. It is perfect for swimming, triathlons, or any type of water activity. The “sports” version was developed for high impact sports and is therefore perfect for kitesurfing, windsurfing, surfing, or SUP. It can of course also be used for any water related activity.

Plans and ideas for the future are vast, and the possibilities are endless: Whether for personal use as a safety backup in the water, as an extra form of safety during water sports, as demonstration equipment at safety training and workshops, or as a basic companion on excursions and tours. The young RESTUBE team is scanning the market and diligently running tests at their own development facilities to further design, sew, and connect. The aim is to raise awareness of the issue of security in the water and providing more freedom to swimmers.


Even with these estimations, the World Health Organization (WHO) believes that drowning is a more serious problem than reported by official sources. Drowning incidents are often not reported in vacation areas so that their reputation is not damaged. In addition, it should be noted that this number does not include natural disasters, suicide, or refugees. Each year, up to 40,000 people drown in Europe, including many athletes. Approximately 100 people die in the water every day. Around 80 percent of all drownings could be prevented by quick or early intervention. Most cases relate to some degree of panic attacks. When panicking, an adult is left with one minute of air until he or she drowns. If you calm yourself or, even better, do not panic at all, you have enough time to get the situation under control. Already in this case, a small float like a Restube is enough to keep the airway clear. In Germany, a total of 438 people drowned in 2010. 80% men, 5% in preschool – more than 50% were older than 50.
Around 1/4 of drowning victims die trying to save other people. They put themselves in danger, quickly reach their physical limits, and don’t forget: even children can become an enormous force and bring adults into a life-threatening situation.

Water poses numerous hazards. With well-considered actions and responsibilities, one can usually remain safe and comfortable. However, unpredictable situations can always occur: a cramp, equipment breaks when you’re far away from the shore… It is exactly in these situations where it is best to be prepared with a Restube.


Those who panic in the water can drown in less than a minute. Even if you would still have sufficient reserves of energy, you may not be able to coordinate your swimming movements during a panic attack and can start to swallow water. This is the beginning of the drawing process. A Restube intervenes early on, almost as a first aid. By pulling the trigger, the Restube inflates as a flotation device and takes the panic away from an emergency situation or prevents it from happening at all. You can hold on to it, relax, and then save yourself with a clear head or wait for others to help. And the best part is that your time in the water is better and you can feel free with a Restube. Try it out and you’ll see what makes RESTUBE so special.

A Restube is not a substitute for a lifejacket or water wings – it is for all the water activities in which one carries little or no security.

If you are in a dangerous situation in the water, you pull the trigger, the float inflates within seconds, and you can then hold on to the float.

The use of a Restube is recommended starting at the age of 10. Children have to understand that they need to pull on the trigger and hold on to the float in dangerous situations. Our first tests with 6-7 year olds showed that they can handle a RESTUBE.

A person close to you is in trouble? This is a critical situation in which you have to be very careful. Without a float, you cannot swim to the person under any circumstances.Otherwise they might drag you down with them. Even with a float, you should be in good physical shape and trained to rescue other people. Yes, inflated or packed in its bag, it can be directly passed to “the victim”. However, it is not advised to tow a person using the safety line. This decreases its long term durability.

Restube has a buoyancy of 75 newton and a volume capacity of 7.5 liters. In an emergency situation, it is most important that the head remains above water. Since the average human head weighs about 6 kg, the buoyancy of RESTUBE is sufficient. As small as possible, as large as necessary.

Yes, with a force of 75 N. For every 10 m of water depth, the pull upwards is halfed.

Yes you can do so by shifting the buoy to your back similar to the infamous BAYWATCH-Buoys. The Restube barely has drag. Afterwords you can hold on to it again.

Theoretically, it is unlimited. It depends on the volume needed to be kept afloat (upper body plus part of the shoulders). This is about the same for most people. That means, Restube always provides enough buoyancy for the head or to hold the airways above the water surface.

Yes, by simply replacing the 16 g CO2 cartridge, the Restube can be used again. The package includes a Restube and an already attached 16 g CO2 cartridge. After a successful application, the Restube can be easily reset for its next use: drain remaining gas, install the new gas cartridge and its safety retainer clip, fold up the float, and stow it away in its bag. CAUTION: Only the original Restube CO2 cartridges are 100% quality tested, seawater resistant, rust-proof, and the inflating force is adapted to the Restube trigger. Other CO2 cartridges cannot be used. Please be aware that there is no guarantee that a Restube actually inflates in an emergency.

Please note: RESTUBE can only guarantee functionality when using an original RESTUBE CO2 cartridge. Please remove any dirt (e.g., sand) and the protective cover from the CO2 cartridge before unscrewing. Now unscrew the empty CO2 cartridge and dispose of it with residual waste. Fold away release lever to avoid piercing the new CO2 cartridge and place the new green securing clip on the red indentation of the trigger mechanism. Now screw on the new original RESTUBE CO2 cartridge tightly, up to the marking of the trigger mechanism. Finally, slide the protective cover over the CO2 cartridge.

Even if a cartridge has already been installed for a longer time in the Restube, it is ready for use. The only important thing is that there is no puncture in the cartridge.

Product description


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For the exact differences, please refer to this page:

English, Spanish, French, Italian, German & Dutch. Ask for other languages.

Packed: 14x7x5 cm Inflated: approx. 67 cm long buoy, 13 cm in diameter

The length of the waist strap depends on the model. The different Restube versions have the following strap lengths: Restube basic: 120 cm (25 mm wide) Restube classic: 120 cm (25 mm wide) Restube sports: 120 cm (30 mm wide) Harness strap (included with Restube sports): 60 cm (30 mm wide) RESTUBE XL belt: 155 cm (25 mm wide)

No, because a Restube is not safe when unconscious.

The basic requirement for PPE is: The product is permanently attached to the body (the Restube is not, because there is a safety line) By attachment alone, the product offers protection against danger (in this case: from drowning). This does not apply to the Restube, as it requires additional movements (triggering, holding) by the user. The Restube does not fall within the EU Directive 89/686/EEC (guidelines on personal protective equipment) RESTUBE requires a CE marking, which would testify that it complies with the guidelines RESTUBE cannot use the CE marking, because it does not fall under a category that is regulated by the EU

Yes, Restubes can be brought onto planes. The original RESTUBE CO2 cartridges contain 16 g CO2 and are pressurized. In aviation, they are considered dangerous. According to IATA, however, up to 4 CO2 cartridges may be brought onto the airplane. The RESTUBE CO2 cartridges should be registered by phone before starting your trip. At the airport, show the supplied green flyer. As a safety measure, put a copy of the flyer around your Restube and into your checked baggage. The built-in CO2 cartridge from RESTUBE has to be unscrewed prior to the flight.

The green clip shows you visually that the trigger lever is in the right position and if you screwed in a newly filled cartridge. All originally packaged Restubes have the green clip as sign for integrity. The clip has a purely indicative function and therefore is not compulsive for triggering the Restube. When triggering, the green clip falls off. To recharge close the trigger lever and screw in a new cartridge. Then the green clip is applied to visually indicate that a new cartridge is screwed in. If you trigger the Restube frequently and the resulting waste bothers you, you can keep off the clip. Please make sure then, that the trigger lever is closed and the screwed in cartridge is sealed/filled.

There are two different trigger systems, both are of equally high quality. On both trigger systems, the new clips fit. If you still have a Co2 cartridge pack with the old clips that do not fit the trigger of your Restube, you can decide to not use it (see explanation above) or ask your local dealer or us for new clips.

CO2 diffuses through the fabric of the float, not normal air. When inflated, approximately ¼ of the total volume escapes from the CO2 cartridge. Upon inflation with normal air, the float should remain firm.

CO2 cartridges

No. Only our RESTUBE replacement cartridges are certified: 16 g capacity, compatibility with the trigger mechanism, and a special alloy for fresh and salt water resistance.

CO2 gas, not to be confused with the gas from cream dispenser cartridges (N2O gas = nitrous oxide).

16 g or 21 ml CO2 -> one inflation equals 8-9 l volume

The pressure of the CO2 cartridge is 57.3 bar at 20°C.

approx. 60 g

The cartridge is produced in Austria.


After use in salt water or, e.g., marshes, the Restube should be taken out of its bag and rinsed with clean water. Briefly lay it out to dry and then pack it back into the bag. Nothing else is necessary!

After using a Restube, simply take it out of its bag and leave out to dry. It will dry very quickly and ready to be packed again. Replacing the cartridge is only necessary after it is triggered.

Generally no, but check it regularly for damage. For added durability, empty the bag after each use and rinse it with clear water. Details can be found in the manual.

The Restube only has to be rinsed with fresh water after use in salt water and then let it dry. After using it in fresh water, you can let your Restube dry in its bag.

You should check the Restube once per season. Check whether the float is still tight, the mouth valve is functioning, the bag and strap are free of damage, and the CO2 cartridge is properly inserted. Under special conditions (for example, long-term use, use in other climates, or frequent wearing >1 time/week or frequent triggering), the product should be checked more frequently and the service life may be shortened accordingly. Restube basic and classic are designed to be triggered 40 times, the Restube sports and lifeguard approx. 80 times. Before each use, the operational readiness of the product has to be checked. Make sure the green safety clip is laterally located on the trigger mechanism and whether or not the float is still properly placed in its bag.

After use/application: 1. Drain 2. Rinse with clear water 3. Allow for it to dry 4. Insert new cartridge 5. Fold float 6. Stow away in the bag 7. Dry


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More freedom in water.

More freedom in water.