Multiple SELECT's

Hmm.. I´ll try to do some quick research on what might be best to use.. these days you gotta think about SEO

Yes.. comma would look best.. but I think "female/black_red_yellow/jeans.html" works as well

ok one vote for the '_'

Done some quick reading now.. "-" would be the best char for the job..

Here's an overview www.searchenginejournal.com/urls-and-seo/16417/
Most people say that you should use hyphens to separate the words in URL

Agree

But then you will always get the x- as well

So 5-red-blue-green

and just for the record, the impact is quite serious, so no idea when and how this feature can be implemented.