I have designed these corsets to be the ultimate waist training/ extreme waist corsets. They have the same boning in the back and front as normal underbusts, but are double boned in the side with 6 spiral metal bones in each side a total of 12 spiral metal bones, and they have extra space for hips, this gives extreme support and they are made for cinching in a lot. They can be worn both by experienced corset lovers and as your first corset. The corset is around 33 cm in the front and around 27 cm in the sides.
To find your corset size subtract 2-6 inches from your natural waist.