At the core of FLOWBIO is the world’s most accurate sweat sensor, measuring your water and sodium loss as it happens. Paired with the FLOWBIO App, raw data is transformed into actionable hydration insights, tailored to your physiology and training conditions — giving you the clarity to train smarter, race stronger, and recover with purpose.
Designed by athletes for athletes to prevent dehydration hangovers, cramping, disrupted post-race sleep, empty legs and poor recovery.
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The Feed (United States)
Aid Station (Australia)
Sport Benzin (Switzerland & Europe)
Whether you’re clocking up miles on the bike or pushing the pace on a run, the FLOWBIO Sensor gives you personalised, science-backed hydration data to help you perform better and recover faster.
FLOWBIO measures your sweat rate (L/hr), sodium concentration (mg/L), and skin temperature as you train. That data is synced to the FLOWBIO App, where advanced algorithms turn it into hydration recommendations specific to your physiology and environment.
It’s more than sweat tracking — it’s hydration guidance. Get preparation tips before each session and recovery advice afterwards to keep your performance consistent.
The Hydration Planner creates session-specific strategies, factoring in intensity, temperature, and your own sweat profile. The result: clear recommendations for exactly how much fluid and sodium you need before, during, and after training.
The sensor can be worn on your upper arm with the included FLOWBIO strap, or paired with your HR chest strap. With a 100-hour battery life and USB-C charging, it’s built to keep up with your training.
The app connects with Garmin, Zwift, Wahoo, and Coros, and works with your preferred electrolyte brand, so it fits into the way you already train.
What sets FLOWBIO apart is its independent validation: lab precision of up to 90% and in-field accuracy as high as 83% for sodium loss. No other system delivers this level of accuracy in real training conditions.
And unlike other platforms, FLOWBIO is a one-time purchase — no subscriptions, just lasting performance insights.
FLOWBIO SENSOR - DEMO
FLOWBIO makes sweat measurable. In just a few simple steps, the sensor captures your sweat data and turns it into personalised insights you can act on before, during, and after every session.
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Shopping from outside the UK? Shipping is calculated at checkout, and local duties or taxes may apply. For faster delivery and better value, you can also order from one of our international retail partners.
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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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.
Please note that prices shown for customers from outside the United Kingdom exclude VAT or relevant import duties. For customers in the UK, VAT is added at checkout.
Currently, data from the Sensor is accessible only during cycling, running or walking activities. We plan to expand and include other sports as we grow. If you are interested in using our Sensor for a different modality please get in touch here.
The Sensor is designed to be worn on an existing heart rate monitor. We support both optical arm-based monitors and chest straps, offering flexibility in wearing the Sensor either on the upper arm or on your back.
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.
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 23 mg 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. If you are interested in learning more about the accuracy of the system behind the Sensor, you can request our whitepaper here.
You can exercise without your phone nearby, but for syncing the Sensor and viewing your data, having your mobile device is essential.
At present, using the FLOWBIO System requires a fitness tracker integrated with the Companion App. We currently support the following integrations:
