Ultra X, Science in Sport and FLOWBIO Partner to Deliver Race-Ready Hydration at Ultra X Wales & England

Ultra X endurance trail events demand more than strength and willpower. It demands strategy. Yet one critical performance pillar has long been neglected — hydration.

Now, Ultra X is breaking new ground. In partnership with FLOWBIO, creators of the world’s most accurate sweat sensor, and Science in Sport, leaders in sports nutrition, Ultra X Wales & England will be the first endurance trail event series to offer race-ready hydration, engineered to each athlete’s unique sweat profile.

No More Guesswork — The Future of Personalised Hydration

FLOWBIO’s Advanced Hydration Intelligence (AHi) gives athletes lab-grade insight into their personal sweat dynamics — measuring real-time sodium loss and fluid loss.

Ultra distance runners are typically under consuming what they lose in their sweat by 2-3X. The result? Chronic dehydration that silently compromises performance, recovery, and long-term health. FLOWBIO captures an athlete’s sweat data each session, enabling athletes to nail their hydration, allowing them to sustain output, recover efficiently and avoid dehydration pains.

Through this new partnership, athletes who purchase a FLOWBIO Sensor can start building their personal sweat profile ahead of Ultra X Wales & England. In the FLOWBIO App, the personalised hydration planner tool ensures every bottle, every sodium sachet, and every tablet is precisely tailored — matching the athlete’s unique physiology, the race demands, and the conditions they’ll face on the day.

A Shared Commitment to Endurance and Innovation

Ultra X, FLOWBIO, and SiS are combining expertise to redefine how endurance athletes prepare and perform. Grounded in data and real-world application, this partnership equips athletes with personalised hydration strategies that reflect the true demands of their bodies and the environments they race in.

Ultra X Wales & England will be the first event where athletes experience Advanced Hydration Intelligence at scale — individualised, real-time, and designed to protect performance and health over every stage.

Check out the Ultra X RIA Foundation Member profile here  . 

Check out the SiS RIA Member profile here  .