Sizing guide

Rune 1 is available in US sizes 8 through 13. Because a smart ring needs consistent skin contact to read reliably, the right fit matters more than with a regular ring.

Measure with a piece of string

Use a non-stretch piece of string or thread. Cut a comfortable length before bringing it near your finger. Wrap it snugly around the base of the finger you intend to wear the ring on, mark where it overlaps, then lay it flat and measure the marked length in millimetres. Never cut the string while it is wrapped around your finger. Match that measurement to the closest row in the Rune 1 size range. A Pulsyn sizing kit is forthcoming and will give you another way to confirm your fit at home.

Sizing tips

• Measure at the end of the day, when fingers are at their largest.
• Measure three to four times across different times and temperatures.
• If you are between sizes, confirm your fit with the forthcoming Pulsyn sizing kit or a professional jeweller.
• The ring should slide on with slight resistance, then sit flush against the base of the finger without pinching.

What if my ring does not fit?

We include free size exchanges within 30 days of delivery. Keep the ring and packaging in good condition and contact support@pulsyn.tech with your order number. For the full return and exchange policy, see the FAQ.

The sizing page has a simple string measurement method and an approximate size chart. If you are between sizes, confirm your fit with the forthcoming Pulsyn sizing kit or a professional jeweller.