MEASURE the smallest part of your waist.
Don't guess, get a measuring tape and measure!
I recommend getting a waist trainer that is 3-4 inches less than your waist size for ultimate compression. If you are new to wearing a waist trainer, choose one that is 3 inches less than your waist size.
For examples, my waist measurement is 25 inches, but I like the XXS which is 22 inches across.
Length: The waist trainers are all approximately 10 inches long in the front and 5.5-6 inches long in the back.
You can always email us as well at email@example.com if you have a question on your sizing.