To be clear, what type of cart system does the site use? VirtueMart? Magento?
I agree with the posts above, in that sometimes it doesn't hurt, but at the same time, you aren't doing the product pages any favors. Two ways to look at this would be:
1. Having the URL structure set up like you example will still get the pages indexed, if they are included in a sitemap, and submitted correctly, furthermore if the content on those pages is a good match.
2. Having the pages set up that way will limit the ranking potential of those pages, by having a long URL, without relevant keywords in place. Let me explain:
In your example:
www.example.com/women/denim-jeans/py/c/109/np/108/p/3834.html
You have the opportunity to potentially rank for "womens denim jeans" using that url. This somewhat limits the ranking potential of the items, as they are all tied into one specific category, that being "womens denim jeans". Lets look at another example:
www.example.com/women/denim-jeans/faded-wash/indigo-dye-item-details3834.html
In the above URL, you are much more specific in the style and type of jean it is, and a user will know (and a search engine) what the page is specifically about. Style, color, keyword, category, etc. Since you most likely have a large catalog of product types, why limit your item details to a bunch of unnecessary numbers and slashes?
I would also look at a way of using product markup to make the items stand out further in search results. Google likes to see "the complete package". Using clean specific URL's and schema product markup tells a much clearer pricture than /py/c/109/np/108/p/3834.html. Depending on the CMS used, there may be a component or plugin that takes care of the product markup for you, from the item description and details.
Hope this helps!