Suddenly that itty bitty weight gain has taken you from a slightly tighter fit in your favorite jeans to the point of considering, gasp, an elasticwaistband.
Until recently, there was some question whether the enzyme sensor solution would handle the stresses of daily life, so to speak, but these briefs were up to the task -- subjected to a torturous gauntlet of bending and stretching, a treated elasticwaistband was still able to adequately measure chemicals as required.