Instanly slims your waist, flattens your stomach, and shapes you!! Get Instant Curves!! They are great for working out or wearing under clothing! The spiral steel bones make for a nice fit with very little buckling. I would consider this trainer suitable for those who are beginners to waist trainer wear AND those who are waist trainer vets. They not only train your waist with continued use, they do wonders for your posture.