My daughter is 9 years old and I took the medium one first and had to go back and take the large one. My daughter is tall and slim and true to her height but she is curvy in the back so after the fit and movement test I felt she sagged too much in the back and she needed a size up. She loves big ones because they are so comfortable. She doesn't have to constantly pull them during exercise. He passes the squat test and the underwear is not see-through. She also likes to wear them under dresses during the cold season. She tells me they suit her fall style better than skinny tights. That's why we love versatility, from workouts to dance to great fall/winter clothing. I treat them like my active leggings which should never be washed with hard materials like denim, tumble dry on a low setting and if it's a top loader, put them on carefully as the center aggregator can wear down some of the stretchy materials.
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