If you’re a watch enthusiast, you probably don’t want to exchange your prized timepiece for a bulky fitness tracker. But Hiyd founder Salah Batroukh doesn’t think people should have to sacrifice fashion for function.

“We don’t think that health tracking needs to be this overly conscious decision where you have to change something about the way you look,” Batroukh told TechCrunch. “That’s the ethos of the entire company. Our plan is to build out this product ecosystem of invisible health tracking.”

Hiyd’s first device to make health tracking look cooler is a small, slim disc that attaches to the back of your watch via microsuction, a material technology that allows the sensor to sit flush under your watch without magnets or adhesive. That way, it won’t leave any residue or mess with the mechanics of watches that keep time using magnets.

“Microsuction is essentially a textured silicone, with hundreds of tiny pockets per square inch molded into a pliable sheet. So when you press on it, it pushes air out of all those pockets, and you end up with a vacuum — just like traditional suction cups but scaled down incredibly,” Batroukh explained. “It works incredibly at stopping shear forces, but a little bit of prying allows it to pop right off, which is ideal for us. It’s also incredibly thin at just 0.3 mm with our manufacturing processes.”

7 mm thick and weighs 7 grams, collects biometrics similar to those of leading wearables, including heart rate, heart rate variability, sleep staging, movement, calories burned, and VO2 max estimations, then syncs to an iOS or Android app.

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