One way you can measure your ring size is to use a piece of string. Choose a string that will not stretch. First, cut a piece of string. Wrap the string around the finger you want to wear your ring on. It’s important that you don’t wrap it too tightly because silicone rings are designed for a snug, but not too snug, fit. You want it to be comfortable.
Mark the string where it overlaps and then compares the string size on the chart. If you fall between sizes, choose the smaller one. Silicone rings tend to relax in about a week. If you choose it too small, you will stretch your ring too far and tear it. Make sure that you have measured it correctly.