These leggings were just what I was looking for.  They are thicker than tights and warm enough for me to wear under my skirt in the winter.  I don't think that they are thick enough to wear outside for a long period of time in the winter but nice for walking to and from my car and in a chilly office.  I have been hand-washing them in cold water sparingly to keep their shape and keep them from shrinking.  I am 5'11" and they are just long enough but could stand to be 1/2" longer (or maybe I should be shorter). I also got them without the hook ankle, those solved the length problem but the hook ankle is nice because it prevents the leggings from riding up and bunching around the knees.

Overall, this product is great and I will continue to buy these leggings.  I wear them a lot and am very happy.  The only problems are minor and it's just because I am an unusual height.