This is a new, unworn with labels waist cincher/girdle.
Pink Latex.
three rows of 14 hooks and eyes front fastening.
It is 11.5" in heoght.
You shoudl measure your waist 2" above the navel.
The website states that XS fits a 23" to 25" waist.
Here is the blurb from the Amazon site.....

Womens High Elastic Natural latex waist trainer: Big and wide 3 Hook and Eye Closure allows for size adjustment, gives you more choice to wear; 25 spiral felixboning supports,flexible and durable,bends easily but recovers quickly to origin Three rows of hooks allow for the size adjustment for the shrinking midsection. High elastic latex. Can be used for yoga, postpartum belly abdomen corset etc
  • Upgraded 2 layers fabric: Inner layer constructed with soft and cozy 14% Cotton+6% Spandex+80% Polyester; Outer layer of 0.8mm thickness 100% High Elastic Natural Latex; Covered boning in front and back for added support, smooth waistline, 3 columns hook-and-eye closure classic design, alow you to adjust size as necessary; Make you Slim and Beautiful.
  • High compression Durable latex will give you a high resistance to slim curve. It will also works for LONG TORSO WAIST. This Rubber Latex Waist Training Corsets helps to reduce 3-5 inches in waist when you wear it.Select the size you like with the size map.Or you could read the product description to select the right size you need.
  • This product is strong enough to be used as a Boned Waist Training Corset, Boosts thermal activity and gently lifts underbust,control tummy just by putting it on.Takes inches off your waist and creates an hourglass figure and promotes a quick postpartum recovery.