FLOWBIO: turning sweat into a hydration decision

Sports hydration often relies on broad rules: drink an approximate amount per hour, adjust for temperature or repeat a strategy that worked previously. FLOWBIO proposes something more individual: measure fluid and sodium losses during exercise.

Its sensor collects sweat through a small channel and combines the signal with algorithms to estimate sweat rate and sodium concentration. The data is then used before, during or after a session to inform a hydration strategy.

Why the problem is interesting

Two athletes completing the same route may lose very different amounts of water and sodium. The same person can also vary with temperature, intensity, heat adaptation and duration.

FLOWBIO's proposition is to replace part of that estimation with continuous measurement. That is particularly relevant in:

• Long-distance cycling.
• Running and trail events in hot conditions.
• Triathlon.
• Race preparation where hydration can be planned.
• Performance centres working with several athletes.

What it measures and how it is used

According to the official documentation, the sensor estimates fluid loss per hour and sodium loss. It has a published battery life of more than 100 hours, USB-C charging and a companion app.

The brand also communicates integrations with Garmin, COROS, Zwift and Wahoo. Whether information is available live or after a session depends on platform and version, so compatibility should be checked before purchase.

The valuable part is not generating another graph. It is turning measurement into decisions such as how much to drink, what electrolyte concentration to prepare or what deficit remains after training.

What we like

A naturally demonstrable product

Content can begin with real questions: “How much sodium do I lose on a three-hour ride?” or “Do my losses change between May and August?”. That is more concrete than selling performance through a generic promise.

A recognisable niche

Spain has strong cycling, running and triathlon communities. A premium product does not need to address the entire population if it solves a meaningful concern for committed users.

Published technical validation

FLOWBIO highlights academic validation against laboratory and field methods. Published work is a positive signal, while still requiring attention to methodology, study population and limitations.

The main frictions

The official price displayed during this analysis was £295, and the product was temporarily sold out direct. This is a high ticket and may add tax, shipping or operational complexity outside the United Kingdom.

There is also a usage burden. The sensor needs to be worn correctly, maintained and understood. A product like this requires onboarding, support and education rather than only an ecommerce product page.

Finally, the category touches health and performance decisions. Communication should not turn a useful metric into a guarantee of safety or outcome.

Commercial fit in Spain

FLOWBIO publishes programmes for stockists, sweat-testing centres and ambassadors. That creates several possible routes:

• Affiliate or ambassador validation.
• Specialist cycling and running retailers.
• Sweat-testing services in performance centres.
• Direct sales supported by Spanish-language education.

Before proceeding, a partner would need to confirm EU warehousing, VAT and duty treatment, applicable documentation, real margin and whether direct fulfilment to Spain is possible.

Radar verdict

FLOWBIO scores 75/100. It combines innovation, a strong product story and a clear Spanish niche. The score is reduced by price, UK logistics, usage complexity and the need to show that the measurement changes decisions consistently enough.

It is a compelling specialist pilot, not a product to launch with broad paid advertising on day one.