Paulien Routs has developed a sweat-sensitive textile coating that can provide a visual cue of hydration levels

Design researcher Paulien Routs has developed SOAK, a sweat-sensitive textile coating that provides a warning of dehydration. It can be applied to sportswear and changes color while the wearer is working out. The different colors provide a visual cue, showing the composition of their sweat and the condition of their internal health.

The spectrum ranges from blue (which means the wearer is well-hydrated with a high amount of base fluids in their sweat), through shades of green (which shows the presence of both base and acid fluids, meaning the wearer is hydrated enough), to yellow and brown (which signifies dehydration due to high amounts of acid fluids in their sweat).

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