Deciding on a breast implant size can be a challenging and emotional decision for many women considering breast augmentation. Selecting the incorrect implant size is one of the most common reasons women undergo subsequent surgeries. L.W. Gatz has created the Purlz? Breast Sizing System to help patients select right the first time. Breast Sizing Purlz? are tester implants designed to simulate the effect of various implant sizes on a woman's body.