A soft, stretchy, and breathable thong turns ... These no-show undies are made with a nylon-Spandex fabric that can stretch up to 400%. We like the Spanx thong for exercise classes because it ...

Nylon is a top pick for all types of workouts ... though it’s also one of the priciest. If you love buttery-soft fabrics that feel amazing on your skin, lyocell is a top choice on this list.