Measure according to body type. If belly is larger than hips: Measure at the same angle you wear your pants, from the small of your back to a point 3"- 4" below your navel. For men, this will be your pant size. If waist is smaller than hips: Measure at your waistline.
If you are in-between sizes, either size will fit. However, most folks size down to avoid having to contend with greater fabric overlap in the front and a longer secondary strap. If your weight fluctuates up and down, it's better to size up.
Most, but not all.
Back-A-Line belts fit some body types better than others. Most men can find a good fit, but some women, especially curvy and pear-shaped women, may not.
Those with spinal anomalies may not be able to use the belt. Back-A-Line's anatomic lumbar pad trains your body to support a neutral lumbar lordosis. If your spinal structure limits your ability to adjust to the lumbar pad, the Back-A-Line will likely be uncomfortable and ineffective.
Over the past 27 years, fewer than 5% of our customers have had to return the Back-A-Line for fitting issues. If you are not sure of the fit, remember that Back-A-Line offers a 30-Day Satisfaction Guarantee. So go ahead and give it a try!