O'Neill size chart & sizing guide
We recommend using the foot length (Mondopoint). Find the official size conversion chart below.
Feedback from our users:
- choose the same shoe size as suggested in the size chart
- suitable for feet with a regular width
Conversion chart - Find your size
|EU size||UK Men||US Men|
How to measure your foot length
Place your foot against a wall and measure the distance from the wall to the tip of your toes.
Manufacturers do not always use the same sizes for shoes. Therefore, we recommend using the foot length to find the correct size. The international standard for foot length is known as Mondopoint and indicates the size of the foot in millimetres (mm).