Mylf Labs - Fully Stacked Fondue Panty is a full body workout panty that will help you build some big muscle and tone up your butt. Mylf Labs was created by Holly Hayden who wanted to create a product that would help women with all of their workout needs. Her product offers a huge variety of options such as sizes, colors, and even has two forms of cardio, a low intensity workout and a higher intensity burnout. Mylf Labs is perfect for anyone who wants to not only look good but feel great while working out..