Did Jawbone Just Make The Slimmest Fitness Band Ever?

One's super slim and the other lets you pay with your wrist.

Hang tight, because Jawbone's fitness band offerings just went from 2 to 4 gazillion.

Okay, just 4.

Jawbone

First up, there's the very thin UP2 ($99), a new band with the same sleep-tracking, step-counting features as the former UP24.

Bradford Gregory / Jawbone

Kinda chic, non? The super slim UP2 pairs with the Jawbone mobile app via Bluetooth for mobile updates. Unlike the Fitbit Flex and Charge, the UP2 lacks a display, so the only way to see your progress is through the app.

It ships April 15 in black on Jawbone.com and Amazon. More colors are coming soon.

It's the most lightweight fitness band I've tried on. Here it is compared to the Jawbone UP24 and Fitbit's Flex.

Nicole Nguyen / BuzzFeed

Some notable features: Jawbone claims that the band's battery lasts 7 days. It's splash-proof (showering and washing your hands), but not waterproof (don't swim with it).

Next up is the Jawbone UP3 ($180), which is not technically news, but Jawbone failed to ship the band after it was announced late last year.

Nicole Nguyen / BuzzFeed / Jawbone

Why the delay? The company originally claimed the UP3 was waterproof up to 10 meters. But because of manufacturing issues, Jawbone could not deliver on that promise. The UP3 is sweat-, rain-, and splash-resistant, like most fitness trackers already on the market.

Here it is compared to Fitbit's Charge HR and Microsoft's Band.

Nicole Nguyen / BuzzFeed

Well, the UP3 will *finally* be available after April 20 for those who preordered the band.

Jawbone

Like the UP2, it's got a battery that lasts 7 days, it syncs wirelessly to your phone via Bluetooth, and offers the same step tracking features. Where the UP3 differs is its heart health sensors that measure heartrate and skin temperature. It's also got a more "advanced" sleep sensing capability.

But Jawbone's biggest ~surprise~ is the announcement of the UP4 ($199), a tracker that you can use to pay for goods with your American Express card.

Chris Gramly / Jawbone

An NFC chip is embedded into the band, allowing you to pay for stuff with a tap of the wrist. You could go for a run, and leave the wallet behind. Pretty cool. But only AmEx customers will be able to use the band as a mobile wallet.

The band is slated to ship this Summer.

Feature-wise, there is still no display on any of the Jawbone bands and you still can't swim with the UP3, but the Jawbone band batteries do last relatively longer than other fitness trackers. Also, the hardware is slim AF.

Bradford Gregory / Jawbone

So, to recap: there's the entry-level pedometer UP Move, the activity tracking UP2, the heartrate-sensing UP3, and the tap-to-pay-capable UP4.

Jawbone