Pull the tail to tighten the tool around your finger ... chart above to calculate the correct ring size. Easy! Annoyingly, yes. While the UK uses the alphabet system and fractions for half sizes ...

Instead of wrist-worn devices with large displays and flexible straps, smart rings are more rigid bands made for wear on a finger ... the dimension chart to pick an Oura Ring size.

£2.99 at amazon.co.uk First, pull the tail end through the buckle to form a loop, and slip your finger ... chart above to calculate the correct ring size. Easy! Annoyingly, yes. While the UK uses the ...