Waist is measured at the narrowest level of the torso
Hip is measured at the fullest level of the glutes

Swim briefs are meant to cover around the hip area, therefore, honor your hip measurements more than waist while you choose the right size for yourself.

*Important note for picking swim briefs: They are made for swimming, so they fit tight around the legs. If you aren't planning to swim in them and want a more comfortable fit, consider size up. Also, if you have thick legs, considering size up as well.*

For swim thongs, honor the waist measurement should suffice.

More details examples for picking swim briefs are blow:
Example A - Waist 30 1/2", Hip 38 1/2":
- Waist is S
- Hip is M
- Therefore, size M will likely fit better.
- If waist is a bit loose, simply tightening drawstring a bit

Example B - Waist 31 1/2", Hip 37"
- Waist is M
- Hip is between S and M
- Therefore, size S will likely fit better if you are going into water
- If you only plan to wear to lounge, size M would be more comfortable

Example C - Waist 33", Hip 39 1/2"
- Waist is between size M and L
- Hip is size L
- Definitely pick L in this case

If you are still unsure, feel free to email us at info@kovarx.com

Last note: We offer free exchanges for sizes!