Jawbone is the latest in a series of wearable brands to fold or leave the business. Pebble, a smartwatch pioneer, sold off some of its assets to Fitbit late in 2016 and Hello, the maker of sleep-tracking device Sense, announced last month that it was ceasing operations and selling its remaining assets. Even GoPro and Fitbit, two companies that enjoyed spectacular initial public offerings and were once considered the future of the wearables market, have seen their valuations tumble as sales slowed.