We blended breathable cotton with smooth TENCEL™ Modal fibers (a fiber made from beech tree pulp) and added a bit of spandex to make a hybrid underwear super-material that’s the best of both worlds: it has a natural, luxe feel, with a resilience that helps to keep it feeling fresh and new, wash after wash. We also added a sturdy comfort waistband to help prevent rolling or digging throughout the day, took away all tags, minimized seams, and created a fit for real bodies: not-too-tight, not-too-loose, so it feels effortlessly supportive.If you’re between sizes, we recommend sizing up.