I ordered these tights to wear under skinny jeans instead of thermal underwear, which bunches up.  These tights are just like a light sweatshirt material with fleece inside, and are very warm under jeans.  I think they are warmer than the thermals and much more comfortable.  I ordered 2 pair and am wearing one now.  I will probably order at least one more, as winter is approaching rapidly in the midwest. I ordered the M/L size and it fits perfectly.  I am 5'6", 150 lbs, and usually wear a size 8T in jeans, these tights are long enough in the legs for me.