A new smart clothing line promises to help you get your yoga moves right when you’re at home and without an instructor. It’s called Pivot Yoga and it claims to give feedback through small sensors on the clothes that can tell you whether you’re in the right position.

“We know how hard it is to learn yoga, how much yogis want to improve, and how many yogis want to practice at home,” Joe Chamdani, who’s the CEO and co-founder of TuringSense, the developer behind Pivot Yoga, said in a press release.

The Pivot Yoga clothes are supposed to “look, feel, breathe, wash, and perform” like regular yoga clothes, but also maintain a wireless connection to the company’s mobile app. You can take online yoga classes through the app and the sensors will insert a “live avatar” of your body into the video so you can easily compare your movements with the teacher’s.

The app has voice control capabilities so you’re supposed to be able to tell it to pause and start again. The app will say, “Garments detected,” and then you can command it to start by saying, “Begin.” You address the smartphone’s voice assistant by saying, “Pivot, how’s this look?” and the assistant will respond to correct your posture with lines like, “Move your right knee six inches.” You can also cast the app to an Apple TV, any compatible Chromecast device, a Samsung TV from 2013 or newer, or connect it directly via HDMI.

But how can the sensors give an accurate reading when a body is in motion?

While the premise of the app and clothes sounds like it’d be a huge boon to yogis, it’s difficult to see how the sensors are able to give accurate readings of a body’s movements while the body is in motion. Pivot tells The Verge, “It’s a big challenge, since every yogi’s body is different, and a good question. We’ve designed the clothes so that sensor movement is relatively rare. And we’re designing the clothes and the entire system so that any remaining sensor movement is handled automatically.”

That seems to imply the clothes stay relatively still while a person is moving, which might not be the most comfortable fit, and definitely means that Pivot is constrained from offering a wide variety of sizes. (Indeed, the clothes are available in XS to XL, but there’s no sizing chart to indicate the precise ranges these sizes run.)

The clothes charge by Micro USB and run on 2.4Ghz Wi-Fi. They’re made of aluminum, leather, fabric, and plastic. There’s a non-replaceable battery that gives roughly five hours of continuous use, according to Pivot. You’re able to machine wash the clothes in cold water, but you cannot put them in the dryer.

Pivot costs $99 for the top and pants, and the online videos cost $19 per month. The app is only available on iOS 11 or higher for iPhone 7 and up, although the company says an Android version is “expected later.” Preorders are now available, and they’re currently only open to residents in the US and Canada. Pivot tells The Verge the clothes can be expected to ship in spring 2019.