According to the complaint filed in U.S. District Court for the Northern District of California, Bal was an early investor in Oura, as well as serving as the company’s “primary marketing arm” in its early years as a cash-strapped start-up.

Another thing worth noting is a lot of people complain about the rings getting scratched, and showing signs of wear pretty quickly. I wore both of these nonstop throughout the day (including while lifting weights) and noticed the silver Ultrahuman was more resilient than the gold Oura, which did get a bit scratched up.

The Whoop band and its app feel more purposefully designed for fitness. While I definitely prefer the Oura Ring as a sleep tracker, the Whoop app and user experience is deeper and more versatile, casting a wide net for all types of athletes and performers.

For the first time ever, Oura Ring is marking down its latest iteration, the Oura Ring 4, for Prime Day. Men’s Health is pointing out this deal so you can score our favorite smart ring at a discounted price. Oura Ring is doing a 15% discount on their brand new tech across the board, which means you can score your colorway of choice.

Amazon Prime Day is here once again and the celebrity-loved Oura Ring 4 is on sale for the first time ever. Save up to 21% off through July 11.