These are tight and made me feel like a sausage at first. They are more like jeggings than jeans.  I am 5'6", 140 lbs and usually wear a size 6-8.  I got the 8.  I have another pair of size 8 "skinny" levi jeans (which have a real zipper and real front pockets unlike these) so I was surprised at how much tighter these were.  They are tight, but stretchy and comfortable.  For the price, I decided to keep them. They will look better on me with a longer top.