Product Description
You pick a bottle, mix your electrolytes, and hope it matches what you lose. Here’s what most athletes don’t realize: two people can sweat the same amount and lose wildly different amounts of sodium.
The Nix Hydration Biosensor is the wearable sweat analyzer that tells you when, what, and how much to drink while you’re still moving.
What Makes This Hydration Monitor Different
Sweat Composition, Not Just Volume
Nix measures the electrolytes in your sweat, so you match your drink to what you actually lose.
Alerts on Your Wrist or Handlebars
Live notifications reach your phone, Apple Watch, Garmin, or bike computer.
A Debrief That Builds Your Plan
Five calculators in the free Nix Solo app turn your sweat data into your next hydration plan.
How the Nix Sweat Sensor Works
A pod under half an ounce clips onto a single-use sweat patch on your arm. Once you’re sweating, it tracks your sweat rate and electrolyte losses (the minerals that keep your muscles firing), including sodium, and streams them to the app.
Nix Hydration Biosensor Key Features
- Real-time sweat rate, fluid loss, and sodium loss data
- Live alerts on your phone, Apple Watch, Garmin, or bike computer
- Five calculators: Priming, Recovery, Custom Drink, Predictive, and Race Day
- Post-workout sweat composition and recovery summary
- Hydration product list sorted by electrolyte content
- Reusable pod weighs under 0.5 oz, with up to 36 hours of battery life
How to Use the Nix Hydration Biosensor
Timing: Clip the pod onto a fresh patch and start. Your first data arrives up to 25 minutes in, once you’re sweating.
Frequency: Save patches for workouts of 45 minutes or longer, since each patch works once.
Pro tip: Test across hot, cool, easy, and hard days to build a baseline.
Ironman Kona athlete Nick Fragnito calls hydration data the metric with the highest impact on performance.
Stop settling for hydration guesswork and start drinking to your own sweat data.
For gear that arrives damaged or falls under the manufacturer's warranty: Please send a photo of the damage or error message to hello@thefeed.com. We will either help process a claim for the product and a replacement product or store credit will be provided, or we will direct you towards the correct place to make a warranty claim for the product. For returns on gear that you have used, we follow the manufacturer's instructions for satisfaction guarantees. This is specific to each gear product, terms and conditions may change.