Halo Wearables, a wearable fitness startup, wants to bring hydration tracking into the mainstream with Halo Edge, the company’s first wearable. Instead of monitoring heart-rate and step-count, Halo Wearables believes tracking hydration will prove more useful for athletes. See Also: Fitbit buys Pebble as wearables consolidation continues “Hydration for us is another element which has significant possibilities beyond counting steps or looking at activity.