Ultimately belt sizing depends on two things, materials and your own personal style. Generally we recommend sizing up from your waist size: if you're a 32 order a 34. If you are between sizes, like a 33, then we recommend ordering a 36.
The good news is that all of our belts are designed with a signature flex weave which gives them roughly 15% give! So even if you size slightly under, our belts give you some wiggle room. If you still have questions, please send us an email and someone from our team of expert belt scientists will be happy to advise you on what size will work best