Hydrospeed
Hydrospeed is the most immersive river sport that exists. You descend the river lying face down on a floating bob, moving with fins and following the guide's line. It is an individual sport, but safe, practiced in a group and always supervised by qualified instructors. Perfect for those who love nature and want to try a direct experience with the force of the water, more physical and up close than rafting. Descending a river with hydrospeed means feeling the water on every part of the body: the waves become part of the movement, the current a travel companion. On the Dora Baltea, in Valle d'Aosta, you can find dedicated routes and complete logistics to practice it safely at all levels.
Hydrospeed was born in France at the end of the 1970s, thanks to three bridge and viaduct engineers – Claude Puch, Pierre Simon, and Maurice Tiveron, nicknamed the impossible swimmers – who had the idea of descending a stream on a small floating board. The first hydrospeed descent in history came from that experiment.
With the evolution of materials and safety techniques, hydrospeed has become a structured sport, practiced today all over the world. The modern bob is a small unsinkable hull, on which you lie face down. The arms guide it, while the fins are used for propulsion and directional control.
What makes hydrospeed unique is the total connection with the river because you don’t “sail over” the water, but you cross it. Every variation in the current is perceived by the body, which becomes part of the movement itself. It is an intense and direct experience, a dance with the current where technique and instinct meet. No river discipline allows such intimate and complete contact with the water element as hydrospeed.
You lie face down on the floating bob, which protects and supports the body as you slide through waves and currents. Arms and torso guide the direction, and the fins generate thrust, movement, and control. The effect is a direct contact with the water that few river sports can offer.
Although it is an individual sport, the descent is practiced in a group for obvious safety reasons. The body, half immersed in the water, with practice becomes a sensor that perceives the variations in the current and reacts instinctively, controlling every move of the descent.
Hydrospeed is suitable for adults and young people aged 16 and over. It requires a good comfort level with water and a bit of leg strength. The part on the river lasts about 1 hour, while the complete activity – briefing, getting dressed, transfers, return – takes about 2 and a half hours.
In qualified centers, the equipment is included: hydrospeed bob, fins, neoprene wetsuit, helmet, buoyancy aid, and booties. You should bring a swimsuit, towel, and a cloth swimming cap.
In Italy, the main destination is the Dora Baltea in Valle d’Aosta, with dedicated sections and logistics ready for every level.
It starts with the technical briefing on piloting and safety, continues with a practical test in a protected area (small lake) to get comfortable with the bob and fins, then you enter the river following the guide on the section selected for the group’s level.
The river part lasts an average of 35-40 minutes for the introductory level and about 1 hour for the next level. The overall activity, including welcome, changing, transfers, and return, takes about 2 hours and 30 minutes.
To make the activity truly accessible, hydrospeed is practiced in steps:
In the water, you will always be in a group, with a guide in front (and, if necessary, others for support) to indicate the best line and supervise every passage.
Qualified centers provide everything necessary:
The hydrospeed is a river bob equipped with a catamaran-shaped hull, a front bulb, two side floats, spaces for arm and pelvis placement, and can be equipped with handles. All equipment is certified F.I.Raft, the Italian Rafting Federation which regulates safety and technical standards for river sports.
Two schools of thought, two different materials: plastic and foam.
A heavier but more malleable material, allowing for greater freedom in shapes. Plastic hydrospeeds have aluminum handles to hold on to and a stopper to empty them in case water enters. Plastic hydrospeeds are used in rafting centers as an introductory tool to the activity.
Hydrospeeds made of foam are used by more experienced individuals, who build them themselves. Foam sheets about 5 cm thick are heat-sealed together using a bodywork heat gun. Once the desired thickness is reached, the final shape is defined using knives, hot wires, and sandpaper. They are decidedly lighter but more difficult to pilot and require a good basic technical level. The hand placement consists of a semicircular hole passing through the hull.
The ideal window for hydrospeed runs from the end of May to the beginning of August, when the river flow is more stable. Each outing is confirmed based on the hydrometric level. If the water is too high or too low, the descent is rescheduled to ensure quality and safety.
The Dora Baltea is a key destination for hydrospeed, with dedicated sections and specialized centers in Aymavilles and along the valley. In some seasons, it is also possible to practice it in Umbria, in the area of the Cascata delle Marmore (Nera river), where the controlled flow allows for short descents. Always check the seasonality and local conditions before planning the activity.
Safety arises from the choice of the section based on the river flow, the level progression, the use of certified PPE, and the constant presence of guides. Hydrospeed involves an average physical effort and the possible risk of small bruises due to contact with rocks in moving water; when managed professionally, serious events are unlikely. Follow the briefing, respect the guide’s line, and always maintain a safe distance.
Hydrospeed involves an average physical effort and always requires the supervision of qualified F.I.Raft guides. Safety depends on the correct evaluation of the river section, the use of certified devices, and respecting the guide’s instructions at every stage of the descent.
Unlike rafting, in hydrospeed you are not on a raft but in the water. The body is the means of navigation; the bob only serves to protect and float you. It is a more physical and immersive discipline, but thanks to the guides and level progression, it remains accessible to everyone.
Mike Horn, a South African explorer, joined the Sector No Limits team in the early nineties. Shortly after, he accomplished some feats at the limit of human possibilities with hydrospeed: he completed the first (and only) descent of Mont Blanc with the river bob, up to the French border. He subsequently broke the record for jumping a waterfall, also using hydrospeed, in the Pacuare River in Costa Rica (22 m). Finally, he attempted the solo crossing of South America, from the Pacific to the Amazon River, using a canoe and hydrospeed.
No, you start at the 1st level with a test in a small lake and step-by-step instructions, then you move up a level when the guide deems it appropriate.
Comfort in water and a good ability to fin are required; the guide always assesses the participant’s suitability.
A swimsuit, towel, possibly a thermal shirt on cool days, and a strap for glasses if you wear them. The center provides the rest (wetsuit, helmet, buoyancy aid, fins, and bob).
