Hiyd is a health tracker that attaches to the watch you already wear

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 believes that people shouldn’t 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 is a small, slim disc that attaches to the back of your watch via microsuction. This material technology allows the sensor to sit flush under your watch without magnets or adhesive, ensuring it won’t leave any residue or interfere with the mechanics of watches that use magnets to keep time.

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“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.”