Measure around the widest section of the upper arm located above the elbow. OvuFirst is to be worn directly on the skin so make sure you are measuring your arm on the skin without clothes over the top for an accurate size. Use a fabric tape measure so that you can get around your arm. If you don’t have one, you can use a piece of string and then lay the string out length-wise against a ruler to obtain the measurement.

• Wristband (One Size)
• Armband Size D: 18cm - 23cm (7in - 9in)
• Armband Size F: 23cm - 34cm (9in - 13.5in)
• Armband Size G: 34cm - 40cm (13.5in - 16in)

If you don't see your size in the checkout or need assistance, contact our friendly Support Team and they'll be happy to help you.