I am very petite but have a bigger gut, so I am very glad I went with the Medium. So far, so good. I have washed them twice and dried in the dryer and so far no pilling or shrinking. I love that they do not attract pet hair and are not scratchy feeling but so warm. I actually wore these alone on days that were -20 to go out and get the mail briefly and my legs did not feel cold. It took a bit to get used to the fabric, but they feel very comfortable now. I love that they don't stretch out in the knees and that they aren't too long for my short legs.