Ring size and skin type
The Helios smart ring is available in black or white, in 12 sizes, from size 6 to size 11.5 (US sizes).
Download the Helios Ring Size Chart to determine your ring size. Print out this page and place an existing ring on the chart’s circles, until you match your ring’s inner diameter. If your ring falls between two sizes, we recommend you order the larger size. However, to ensure the most accurate ring size, we recommend you visit your local jeweler for a professional sizing.
When you use the Helios ring, you have to make a personal profile and enter your skin type.
It's very important that you select the right skin type!
There are 6 different skin types, that have their own reaction to vitamin D and sunlight. You can download the skin type test and decide which skin type you have