These are one of the most comfortable sandals that I have ever owned, but....I have never had a problem with foot odor in the past..but for some reason the material in the "insole" of these shoes cause me terrible foot odor..and it stays in the material..and because it is a sandal everyone around me can smell it.  I have never heard of anyone having foot odor problems in a sandal!!!  I switched to other shoes thinking that it may be a problem with me....but it isn't...it only happens in these shoes.