Emily,

I have been thoroughly impressed with all of the CW-X products.  They have all different types of tights and/or shorts.  I know that they have Insulator tights which I think is what you are looking for.  I run all year long in Utah where the weather is not always the best and plenty cold.  I don't even use the insulator tights and they keep me plenty warm.

Go to their website and you can check things out under the tight selector tab.  Here is the homepage.  http://cw-x.com/Default.aspx

I actually have found that I like the tights so much during the winter that I have purchased the compression shorts for all other seasons.

Good luck!

Michael

Emily - I recently found a brand called PLUSH and their leggings are perfect for running.  They're not meant for running I dont think, but I've been using them every day to run and as thermals when I ski.  There are 2 versions - one is a fleece-lined tight.  The 2nd is fleece-lined, but the outside has nylon shell that you were looking for - it's called the Stitched Legging #P301G.  I wear these out at night too!  you can check them out at www.plush-apparel.com or http://www.barenecessities.com/search.aspx?search=plush&ft=1.  They're so versatile and are perfect to run or cycle in.