Thee elastic belts were designed to give you the comfort you never realized you were missing with a leather belt. No buckle bulge, no gap in the back of your pants, ultra-comfy AND machine washable, you'll never miss your leather belt again. One size fits most, going from 24" to 65". To adjust, just move the slider over until you get the perfect fit. We recommend putting the belt around your waist first prior to sliding through your belt loops to make lengthening/shortening slightly easier.