By slip proof I'm assuming that you mean the oil stains you find on the ground at toll booths. I have only gone through 1 since I got the shoes. Everything went well but to tell you the truth I wasn't thinking about it. However, I have noticed that they do not slip on surfaces where most shoes would. This usually happens in the garage where there is some kind of glossy paint and all sorts or liquids. So I would say that if they're good in the garage they should have no problem on asphalt no matter what is on it.
1 year ago