Womens Siren Thong S - Black. Soft and simple underwear that offers minimalist comfort thanks to our corespun fabric, the Siren Thong pairs perfectly with both athletic shorts during a workout, or a casual dress later that night. Our corespun fabric uses nylon fibers wrapped in merino wool for added strength and durability that retains next-to-skin softness. The forward side seams and bulk-free design make for simple, chafe-free comfort during both active and daily wear.