Casio has designed a special heat-resistant, moisture-resistant watch that you can wear into a sauna. The coiled wristband mimics the locker key wristbands you get at a traditional Japanese onsen; this design stands off of your wrist, to avoid getting soaked with sweat. The lens reportedly won't fog up, and the watch contains a 12-minute timer mode, so you can perfectly time your cold plunges. It's a niche enough product that Casio hasn't committed to a major production run. Instead they're launching a campaign for it next month on Japanese crowdfunding site Makuake. It's expected to run in the 10,000 - 11,000 (USD $60 to $70) range.