I suffer pain from severe spinal stenosis. I've tried at least five different back supports. All, except this one, feel like a Victorian corset, too stiff and aggressive; wearing one can increase my discomfort. This product does not. It's lightweight with plenty of elasticity, offering two significant benefits. It can be worn comfortably and unobtrusively under clothing next to the skin. It provides a mild soothing pressure on the affected vertebrae just above the tailbone. A small triangular pad presses and supports.The only deficiencies are that it tends to ride up, requiring frequent adjustments during the day, and the top curls over when sitting. I purchased two of these, so I have one to wear when the other is in the laundry.The sizes are not determined by trouser waist measurement but by circumference at the navel level. If you are close, favor a larger size.