If you are losing weight, using these to hold up your jeans is a good interim solution to the falling pants problem.  Puts off the day when you have to buy new jeans to avoid embarassment.  The large size stretches enough to be used for a 2x waist.  Might be a little tight for larger waistes.

Threading them through the belt buckles is time-consuming, so you might want to buy enough so that you have one for each of the frequently used jeans plus a spare for other colors.