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People do both.  They will search for particular sizes as well as general broad searches and then once on the site, drill down to their particular size.

Thanks for the response.

I was leaning that way simply because unique content would be so much easier.  Plus, the management aspect of 300+ unique pages would be a pain to deal with.

I'm revamping my wife's ecommerce site.  It is currently a very low traffic website that is not indexed very well in Google.  So, my plan is to restructure it based upon the best practices that helps me avoid duplicate content penalties, and easier to index strategies.

The store has about 7 types of products.  Each product has approximately 30 different size variations that are sometimes specifically searched for.

For example: 20x10x1 air filters, 20x10x2 air filters, 20x10x1 allergy reducing air filters, etc

So, is it best for me to create 7 different products with 30 different size variations  (size selector at the product level that changes the price) or is it better to create 210 different product pages, one for each style/size?