CHOOSING THE RIGHT SIZE: See 2nd product picture for how to measure then refer to size chart; S: 33-41" / 85-104cm belly circumference;M: 38-45" / 97-114cm belly circumference;L: 42-49" / 107-125cm belly circumference;XL: 46-54" / 116-137cm belly circumference;XXL: 52-60.5" / 131-154cm belly circumference. Measure from around your lower back to under your belly; Do not choose according to your maternity pants or trousersFully adjustable to accommodate abdominal growth throughout pregnancy; Features new reinforced hooks and loops fabric fastenersBreathable fabric constructed of a multilayered laminate with an elastic lining.Designed for walking or standing position; Detach the hooks and loops fabric when sitting.Supports the lower back by redistributing pressure more evenly on the surface area the back support covers.