ADVANCED HYDRATION INTELLIGENCE
Hydration is usually a guess.
Most athletes do not know how much fluid or sodium they lose when they sweat. They follow generic advice, then fade late in sessions. That can mean cramps, lost watts in the heat, poor sleep after racing, and slower recovery.
Measure what you lose.
The FLOWBIO Sensor is the world’s most accurate sweat sensor, independently validated to deliver lab precision. Built to analyse your sweat as you train, it measures fluid and sodium loss, then syncs with the FLOWBIO App for clear, personalised hydration recommendations.
DATA IN, STRATEGY OUT.
Wear the sensor. Capture sweat data. See results in the app. Then act through the Hydration Planner. AHi® combines sweat data with effort and environment to turn results into a session and race plan, so you know what to drink, when, and why.
PRE SESSION
Know the exact volume of water and concentration of sodium amount to consume in the build-up to your session or race.
DURING SESSION
Your personal sweat profile evolves and adapts to your fitness level, workout intensity and environmental conditions.
POST SESSION
Understand how to replenish your body with the right volume of water and amount of sodium to enhance recovery post activity.
FILL THE GAP
The Neglected performance pillar
Hydration is a neglected pillar of an endurance athlete’s regime. A clear understanding of your daily fluctuating Sweat Profile is foundational to becoming a stronger, faster athlete.
UNLOCK YOUR NEXT-LEVEL
ADVANCED HYDRATION INTELLIGENCe.
Think of AHi® as the brains behind your FLOWBIO System - the sensor & app working together. It takes the data from your sweat - fluid & sodium loss (salt) - mixes it with key information like temperature and intensity, and turns it into personalised advanced hydration insights. Your sweat, decoded - so you know exactly what to drink, when, and why.
Trusted by endurance athletes worldwide.
THE SCIENCE OF SWEAT.
We have a published independent, peer reviewed validation study assessing the performance of the FLOWBIO Sensor against established laboratory reference methods used in sport science.
The study, published in Frontiers in Physiology, evaluates the FLOWBIO Sensor by comparing wearable sweat analysis with laboratory and field standards e.g. Nude body mass for sweat fluid loss, L’Aqua Twin and flame photometry, for sweat sodium measurement.
For FLOWBIO, the decision to pursue independent academic validation reflects a clear position. Hydration data should not be assumed, inferred, or internally benchmarked. It should be measured, compared, and published under scientific scrutiny.
Frequently Asked Questions
HOW ACCURATE IS THE SENSOR?
Our latest data has indicated that we are 90% accurate in lab based conditions. In the field we achieve accuracies up to 83% for our sodium with as little as 180mg difference (that is 6x less than a pinch of salt). Our fluid loss is 73% accurate with as little as 250mL difference to in-field gold standards.
We also independently validate our sensor which showed that we are no different to the in-field gold standard for sodium (L'AquaTwin) and not significantly different to the gold standard for fluid loss. We tested this in hot and dry and hot and humid conditions for indoor cycling. You can find the validation study here.
The independent validation study was conducted by an international team of sport science researchers led by David Bandiera, with co-authors Jean de Bardonnèche, Delphine Margout-Jantac, Léa Dubois, Nisrine El Allaoui, Jonathan Steven Elie Rubio, Jean-Christophe Aubin, Sébastien Racinais, Antonio Tessitore, and corresponding author Yannis Pitsiladis. The research was carried out through the University of Rome Foro Italico and the CREPS Montpellier, alongside collaborating academic institutions, with support from Human Telemetrics.
HOW DOES THE SENSOR WORK?
The Sensor captures your sweat and analysis its contents. Proprietary algorithms use the sensor data to estimate your sweat rate and sodium loss. The data is shown on the FLOWBIO App, offering recovery and preparation suggestions and tips to optimise your performance.
WHAT DOES THE SENSOR MEASURE?
The Sensor measures your sweat rate and sodium loss, helping you optimise your recovery and prepare for training and events by ensuring you replace and bring the necessary fluid and electrolytes.
HOW LONG DOES THE BATTERY LAST?
The battery life is 100+ hours and the device can be charged using a USB-C cable.
DOES THE SENSOR USE A NEEDLE LIKE THE SUPERSAPIENS?
No, the Sensor does not have a needle. We collect sweat through a tiny channel using the pressure exerted by your sweat glands.