Nix Sweat Patch Refills – 4 Single-Use Hydration Patches for Reusable, Rechargeable Pod, Tracks Fluid, Electrolyte, Sodium Loss, Non-Invasive, Adhesive-Only Fitness Accessory for Athletes and Training

From the brand

Nix Biosensors

The first biosensor to analyze sweat and provide personalized hydration data — scientifically validated and delivered in real time.

Revolutionary Sweat Science

The Nix Hydration Biosensor pairs via Bluetooth to the free Nix Solo app and provides personalized hydration data to your phone, smartwatch, or bike computer. Our sensor continuously measures fluid and electrolyte losses through the duration of a workout and tells you when, what, and how much to drink providing real-time, actionable data. Nix also provides predictive sweat data, priming recommendations, and recovery insights.

Personalized Hydration Data

Real-time, actionable hydration data and alerts including total fluid losses, electrolyte and sodium losses, and replenishment needs.

Actionable Hydration Insights

Individual insights include predicted hydration needs, recovery strategy, environmental data, beverage recommendations and more.

Nix Solo Calculators

5 free in-app calculators help you identify your predicted hydration needs, recommended priming protocol, recovery strategy, and more.

Can I Wear This Around the Clock?

No. Since our device is sweat-powered, you must be sweating in order to receive accurate and actionable data.

Can I Reuse a Sweat Patch?

You cannot use the same Sweat Patch for multiple workouts. A new Sweat Patch must be applied at the start of each workout. Once sweat has already moved through the flow path on the back of the patch, it cannot be worn again to start a new workout.

Are There Any Needles?

No. The pod clips on to the sweat patch and sticks to the surface of the skin. It is a completely non-invasive adhesive.

Designed Exclusively for Use With The Nix Hydration Biosensor – These single-use adhesive patches are engineered to work exclusively with the reusable, rechargeable Nix Hydration Biosensor. Each patch measures your unique sweat composition in real time to deliver personalized hydration insights. The perfect fitness accessory for endurance athletes training for their next marathon, Ironman or triathlon.
Single-Use Patches For Accurate Results – The Sweat Patch Refill Pack includes four individual sweat patches, each intended for one workout session only. The patch sticks onto the surface of the skin with kinesiology tape. Made from a latex-free medical grade acrylic adhesive. Simply clip the Nix Pod onto your patch at the start of each workout and begin the session within the Nix Solo app to ensure optimal sensor accuracy and consistent data tracking.
Sweat-Powered & Science-Backed – The Nix system activates only when you’re actively sweating. No needles, no blood, just adhesive. The hydration monitor gives you personalized sweat metrics like fluid and electrolyte losses directly from your sweat for smarter, safer training.
Built For Endurance & Race Prep – Over 70% of Nix users use their biosensor while training for endurance events or races. Ideal for endurance sessions 45+ minutes or longer including brick workouts, long runs or bike rides, and race training. The Sweat Patch Refill supports serious athletes focused on peak hydration and recovery.
Safe, Non-Invasive & Easy To Apply – Completely non-invasive and skin-friendly adhesive design for all athletes. No cleaning required. Not a glucose monitor, continuous monitoring device, or medical product. For fitness and performance use only. This product can only be used in connection with the Nix Hydration Biosensor Pod and Nix Solo app.
Precision Sweat-Sampling & Patch Technology – The single-use Sweat Patch, worn on the bicep, requires as little as 4.5 microliters of sweat to initiate a reading, allowing the pod to rapidly assess local sweat osmolality and electrolyte concentration, then extrapolate your whole-body losses. The patch features a sealed reservoir and micro-flow channels that begin to analyze as soon as you start to sweat, maintaining accuracy of your sweat data from your specific biomarkers.