Live during your session
How much fluid you lose.
Nix tracks fluid loss as you sweat, helping replace broad estimates with information specific to your body and conditions.
Use it to inform when and how much you drink.
SOS×NIX
Preferred hydration partner
Personal hydration, powered by your sweat
Know what you lose. Replace it with purpose.
Nix measures fluid and electrolyte losses in real time. SOS helps turn those insights into a hydration routine built around you.
Real timeduring active sweat
< 0.5 ozreusable pod weight
36 hrbattery life, up to
Fluid loss
Measured live
Rate + total
Electrolytes
Personal profile
Sweat composition
Live sweat signal
From patch to plan
Hydration without the guesswork.
Wear the sensor during a sweat-inducing session of 45 minutes or longer, then use your personal data to make informed hydration decisions.
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01
Wear
Apply a single-use patch to your bicep and attach the reusable pod.
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02
Move
Train as normal while Nix reads your sweat moment by moment.
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03
Learn
See fluid and electrolyte insights in the Nix app or on your watch.
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04
Rehydrate
Use your data to build a more personal SOS hydration routine.
Your sweat tells a story
See what Nix measures.
Explore the signals that turn a workout into useful hydration intelligence.
Personal sweat profile
What leaves with the water.
Electrolyte losses vary from person to person. Nix analyzes your sweat to help make those differences visible.
Use it to shape a more personal electrolyte strategy.
Data translated
What to do next.
The Nix app turns live and post-workout data into hydration guidance you can use in training and future sessions.
Connect what you measure with a practical routine.
People have more hydration options than ever, but they still lack a clear way to know precisely how much they need for their body.
James Mayo · CEO, SOS Hydration
Preferred Hydration Partner
Data meets something you can drink.
Nix helps reveal your individual sweat profile. SOS gives you a practical electrolyte format to act on that intelligence before, during and after demanding sessions.
NIXMeasure + understand
→
SOSReplenish with purpose
Build the complete system
Start with SOS. Add your Nix.
Choose an SOS format for your routine, then explore the Nix Biosensor to make your hydration strategy more personal.
$20off Nix
Ready to know your sweat?
Explore the Nix Hydration Biosensor and current SOS customer offer.
Offer and product availability may vary. Nix requires active sweating to collect data.