The FLOWBIO Sensor measures your real-time fluid and sodium loss as you ride — lab-grade sweat data, on your wrist. Pair it with your STACK'D plan and know exactly what to drink, and when.
See the scienceClip the sensor on and train. No needle — it reads your sweat as you sweat.
Live fluid & sodium loss on Garmin, Wahoo, COROS or in the app.
STACK'D turns your numbers into the exact sachets to drink, and when.
The FLOWBIO Sensor has been independently, peer-reviewed and validated against laboratory reference methods for sweat fluid and sodium measurement. Hydration data you can act on — measured, compared, and published under scientific scrutiny.
The world's most accurate wearable sweat sensor. Free delivery across South Africa.