The average person sweats between 0.3 and 2.6 liters per hour during exercise. Sometimes, the bacteria on your skin combines with the secretions released by your sweat glands, which produces an unpleasant smell. Gross, right? What’s more cringeworthy is that many people aren’t aware of their own body odors, mainly because you become desensitized to the same smells over time.

Introducing SweatSense, a new feature on Fitbit trackers that helps you stay on top of your personal hygiene goals. Fitbit tracker bands are reinforced with an advanced material that’s highly sensitive to changes in heat, moisture and chemical composition. Now, a simple firmware update will activate this technology, enabling your tracker to analyze smells in real time—and alert you when your scent has reached an offensive level.

Using SweatSense is simple: Just hold your tracker within 6 inches of your area of concern. If your tracker band turns puke green, this indicates that you’re currently emitting a foul odor and should avoid human contact until you can find the nearest shower. In other words, something’s funky, and it ain’t the sounds of a sweet sax solo.



SweatSense also records your smell trends over time, giving you a clearer picture of your peak P.U. moments and what’s triggering them.

SweatSense was designed to analyze a wide range of human smells, including generalized B.O., head sweat, knee pit sweat, stinky athlete’s feet, and the increasingly common condition known as “swamp booty.” So you can work out as hard as you want and still know you’ve got all your parts covered.

When it comes to smelly sweat, ignorance is far from bliss. Take charge of your odor with SweatSense, so you can stay not just physically fit, but socially fit, too. Because none of us wants to end up like “B.O. Bob” in accounting.

Ready to knock some sense into your sweat? UPDATE YOUR TRACKER’S FIRMWARE HERE.

Source: Rehrer, N. J., and L. M. Burke. Sweat losses during various sports. Australian Journal of Nutrition & Dietetics 53: S13–S16, 1996.