I know this not fashion oriented foot wear. But I fly fish a lot and use a boot by a company called Kokers. They have a great system for interchangeable outsoles. This is an important feature because of the spread of invasive animal species. There has been a big push to rubber outsoles with spikes. This does not grip as well as the old felt soles. But keeps the animal life form hanging in you outsoles to a minimum. But if you want felt soles you use to have to buy a different shoe. With there design you can just easily replace the felt outsole for a new rubber spike sole for watersheds that require it. It works I have swapped the outsoles many times with out much problem.