You can find the approximate internal dimensions of each Ring 3 size below. The above table should be used as a guide, and we don’t recommend using the dimension chart to pick an Oura Ring size.

Heiden also advises that skate sizing varies: “Every skate brand has a different cut, just like a pair of jeans. If you’re a 26 in one you, you might not be a 26 across the board,” she says.