Olythra

• The ring should slide over the knuckles easily, but be tight enough not to fall off.

• You can take a strip of paper and wrap it around your finger, marking the meeting point and measuring that length. That length is the circumference.

• Alternatively, you can measure the diameter of a ring you have that fits you.

Size - Circumference - Diameter

XS - 49 - 15.6mm
S - 52 - 16.6mm
M - 56 - 17.8mm
L - 60 - 19.1mm
XL - 65 - 20.7mm