These are the type of boots that have a rounded knee to fit right on your knee cap. Unfortunately at 5'1 the rounded bulge sat well above my knee and fit like thigh highs. Calf circumference is great for bigger/ muscular calves, but if your under 5'5 I would NOT recommend this style. Returned for the mid calf's in the same brand and color and I LOVE them because they sit right under my knee