R.,
The other posters idea did not work for me. We have 3 and it was always the same child that caused the issues and blew it for all of them, so they ended up hating her often.
So I wouldn't do it. But then maybe you're children will be better than mine.
I gave up on lots of rules and went for general guidelines, values and morals. I'd tell them the end result I expected. How they got there was somewhat up to them. This has not worked all the time, and sometimes I want to runaway to a quiet place but the results are not bad..... And it's worked for me most of the time.
So far none of my teens (and I'm knocking on every piece of wood I can find right now) hasn't done drugs, smoked, had sex, failed school, or done anything irresponsible. And they have exceeded my expectations in school for the most part and are very nice people for the most part.
So, after getting to the teen years with my trio and only 3 more years till the last one reaches college... I'd say forget the shoes, make flexible rules and get to the pool. Time flies. Choose your battles well.