Trying the sizing ring: It is important to first use the sizing kit to determine the Ring AIR size. Wear the ring such that the engraved size number is toward the palm of your hand.

• Take the two night test: Wear the Ultrahuman Sizing Kit ring over two nights or 48 hours to find your fit.

This is an important step in understanding your ring size. The perfect ring size ensures that you have the most accurate readings.

• Fit check: You will get highest data accuracy and optimal comfort with a properly fitting Ultrahuman Ring. If you rotate the ring on your finger, it should not rotate freely.

• Finding the correct finger: For optimal comfort and advanced sleep tracking, we recommend you wear the Ultrahuman Ring AIR on your index, middle, or ring finger.

• Color choice: With the true-to-life color swatches, you can visualize and pick the color you like.

• Choose your ring: After you've precisely determined your size and preferred color using our sizing kit, head back to Target.com to order your Ultrahuman Smart Ring.

• Build quality: While our sizing kit is made of high-grade plastic, the Ultrahuman Ring is crafted from space-grade titanium and coated with Tungsten Carbide, your Ultrahuman Smart Ring promises superior quality and durability.