For our hypoallergenic undergarments to be functional, we believe they need to offer a little bit of stretch without losing their overall ability to provide allergy-free comfort to our customers. That's the reason why we use a special elastic made with white rubber tape and wrapped in 100% organic cotton. This latex-free and spandex-free elastic, made with one-third the thickness of standard rubber, achieves that stretchable feel and ensures an itch-free experience without natural rubber latex proteins that cause allergy symptoms.  This special material also presents much higher endurance and quality elasticity without any harmful stuff. If you want to know more details about our special latex-free elastic, please see our Latex-Free Rubber Certification. You may also read our additional resource about our material here: We Use Latex-Free Rubber For You To Have That Itch-Free Day.