This heavy duty latex material cleaves to your body and instantly gives a contoured waist and hips. The waist trainer has 4 sets of 3 linking hooks along with one midline zipper as well as two adjustable Velcro belts. Clients have stated starting in the first hook on Friday and being able to get into the 3rd hook by the next Friday. The shrink game is real. Trainers do run 2-3 sizes to small.