General questions

The Nix Hydration Biosensor takes continuous readings of your sweat locally on the bicep and applies our proprietary algorithms to extrapolate your full body sweat profile. Measurements are taken every second and processed data is sent to your phone, sport watch, or bike computer in real-time.

Analyzing your sweat informs you about your individual fluid and electrolyte needs. There is massive variability in sweat rate and sweat composition from one individual to another - and even for one individual from one day to the next. Analyzing your sweat across a range of environmental conditions, sport types, and workout intensity levels, you can create a personal sweat profile that provides a bespoke strategy for fluid and electrolyte replenishment that is tailored to your particular needs on a given day. This allows you to combat dehydration and optimize your performance.

Our biosensor has been tested on thousands of athletes - from runners, cyclists and triathletes to soccer, hockey, and basketball players to service members and firefighers. Our algorithms were trained and validated with this data as compared against gold standard lab-based methods.

The bicep provides one of the strongest correlations for local-to-full-body extrapolation of fluid and electrolyte losses. There are other parts of the body that also allow for strong correlations but are less optimal for adhesion of the patch or user's experience.

Make sure your hydration biosensor is fully charged. After downloading the app from the Apple Store, create a user account. Make sure your phone's bluetooth is turned on and follow the instructions on the app to get started. You are now set to get that workout in.

The Nix Hydration Biosensor is the only hydration sensor that provides data continuously, passively, and in real-time - when hydration data is most critical. Our platform also summarizes each user's individual historical sweat profile and leverages it to make specific hydration strategy recommendations for future workouts.

Product detail questions

36 hours.

Proper placement of the sweat patch is imperative. The patch should be placed in the middle of either the left or right bicep with the patch facing upwards. Placement on another part of the body will result in inaccurate information.

The biosensor only requires 4.5 microliters of sweat to obtain a first reading. However, it can take up to 10 or 15 minutes for the body to produce enough heat to trigger sweating, and the bicep is not the first part of the body to begin sweating. Due to that physiology, you may percieve you've begun sweating before data accumulates. But rest assured, our algorithms account for all of this.

The pod must be clicked into the charging case and connected to the power cord and power source for it to be charged. When on the charger if the LED is blinking it is actively charging. The following colors and speeds indicate charging status. Red = Low battery, Amber = Medium Battery, Green = 50% or more charged. A solid green LED indicates the battery is fully charged.

The color of the LED on the pod indicates the battery life. A green pod indicates over a 50% charge. A yellow light indicates 20-49% charge. A red light indicates below 20% charge. The LED will also blink blue when in Bluetooth paring mode.

Our sensor is water resistant to sweat and rain, but is not currently submersible. Future releases of the electronics will be waterproof. In the meantime, do not use this product swimming or in other water-based sports. Triathletes should apply the patch to towel-dried skin after the swim.

No. The sensor clicks onto a disposable patch that sticks to the surface of the skin via kinesiology tape. It is completely non-invasive.

The sweat patch is made from medical grade adhesive which is made from an acrylic adhesive and is latex-free.

Yes, just be aware of any apparel or accessories that might bump or pull the biosensor off your arm.

Sunscreen, bug spray, lotion, etc. can all interfere with the sensor's readings if they get mixed into the sweat. To mitigate that, we recommend those items get applied after the sensor is applied, as the sensor will seal off the outside environment.

No, once used, the sweat patch must be thrown away or recycled.

No, accurate data calculations rely on your personal body metrics which are entered during profile setup and tied to your pod. But you're welcome to Refer A Friend for those who are eager to experience the platform for themselves.

Yes, is it ok to dispose of the patches with general household trash. That said, Nix offers complimentary recycling through our partnership with Terracycle. You can learn more here.

Yes. We have partnered with TerraCycle to allow you to recycle your disposable single-use Sweat Patches at no cost to our customers. Click here to learn more.

Nix app and integration questions

We are initially launching with Apple and Garmin watches. Garmin bike computer integrations are planned for early Feb 2023. Additionally, we have many more integrations on our list that will come in the near future.

D2™ Delta

D2™ Delta PX

D2™ Delta

D2™ Air X10

D2™ Mach 1

Darth Vader™

Descent™ Mk2 / Descent™Mk2i

Descent™ Mk2 S


Epix (Gen 2)

fēnix® 5 / quatix® 5

fēnix® 5X / tactix® Charlie

fēnix® 5 Plus

fēnix® 5S Plus

fēnix® 5X Plus

fēnix® 6 / 6 Solar / 6 Dual Power

fēnix® 6S / 6S Solar / 6S Dual Power

fēnix® 6 Pro / 6 Sapphire / 6 Pro Solar / 6 Pro Dual Power / quatix® 6

fēnix® 6S Pro / 6S Sapphire / 6S Pro Solar / 6S Pro Dual Power

fēnix® 6X Pro / 6X Sapphire / 6X Pro Solar / tactix® Delta Sapphire / Delta Solar / Delta Solar - Ballistics Edition / quatix® 6X / 6X Solar / 6X Dual Power

fēnix® 7

fēnix® 7S

fēnix® 7X

First Avenger

Forerunner® 245

Forerunner® 245 Music

Forerunner® 645

Forerunner® 645 Music

Forerunner® 745

Forerunner® 935

Forerunner® 945

Forerunner® 945 LTE

MARQ® Adventurer

MARQ® Athlete

MARQ® Aviator

MARQ® Captain / MARQ® Captain: American Magic Edition

MARQ® Commander

MARQ® Driver

MARQ® Expedition

MARQ® Golfer

Venu® Sq

Venu® Sq. Music Edition

Venu® 2

Venu® 2 Plus


vívoactive® 3 Music LTE

vívoactive® 3 Music

vívoactive® 4

Your phone is required to be with you during a workout if you'd like to receive live updates about your fluid loss and hydration suggestions. If you don't want to carry your phone with you during your workout, you will not receive live updates, but you will be able to have full access to view your data afterwards.

First ensure that the light is blinking on the pod. If not, push the button on the pod and retry ending the workout.

We are currently available on iOS devices. Android compatability is expected for Feb 2023.

Your phone is required to be with you during a workout if you'd like to receive live updates about your fluid loss and hydration suggestions. If you don't want to carry your phone with you during your workout, you will not receive live updates, but you will be able to have full access to review your data afterwards.

Series 3 or newer

Ordering & shipping

USA and Canada customers can order on our website. International customers can place an order with our partner

Yes, we are able to ship to APO/FPO and P.O. Boxes. All orders to those destinations will be sent by USPS Priority mail.

Standard shipping is offered to all consumers and should arrive within 4-10 business days. Expedited shipping is offered for an additional fee.

Yes, we are able to ship to the Virgin Islands, Puerto Rico, American Samoa, Federated States of Micronesia, Guam, Marshall Islands, Northern Mariana Islands, and Palau. All orders to those destinations will be sent by USPS Priority mail.

You can log into your account to check your order status. If you don't have you account set up yet, you can get a one-time password here. You will need to use the email address you placed your order with.

Due to the personal nature of our product, we are only able to accept unopened and unused items that were purchased from our website within the last 30 days. Click here to view our full return policy.

We are currently in the process of building an ambassador program and we will roll out information in the coming months about when and how to apply. Make sure you're following us on social to stay up to date with new announcements and opportunities.

Troubleshooting Assistance

We recommend force quitting your Apple Watch using the following steps:
1. Make sure you are in the app you'd like to force quit
2. Press and hold the side button unit the power screen appears
3. Now press and hold the Digital Crown
4. When successful, you'll see an animation of the app closing as it fades to the watch face.
If you are still having trouble, please try resetting your Apple Watch. Finally, if that doesn't fix it, check the app for updates.

In order to ensure you have the right version of the Apple Watch update, please delete the Nix app from your phone and re-install it. This will ensure the correct version of the Apple Wacth app is installed. Please keep an eye out as well for the Apple Health prompt on first launching of the Apple Watch and be sure to allow the permissions requested.

You can turn on voice notifications for your Airpods on your iPhone. Go to Settings > Notifications. Scroll down to "Siri". Then make sure that the "announce notifications" feature is turned ON.

After downloading the app you'll be prompted to create an account. To complete your registration you will receive a 1x code from Please check all your email folders, including your spam folder to find this email.