That is a very good question. I am pretty sure that leather CAN be cleaned (especially treated leather) so I would assume that leather would be no worse to deal with than any other material. However, I really don't know for sure and I am glad you asked. Now, let's just hope someone that knows replies. My guess (and it is only a guess) is that treated leather would be fine because it would not be as porous as untreated leather and could be cleaned easier. But some other material is flimsy and irritating and I understand where you are coming from. Some materials are just not very comfortable and with hard use can be flimsy and also create 0ther irritations. So, the material for the belt is even very important. I am so glad you asked this question.