THESE WOMEN'S LEGGINGS ARE MADE FROM BIO-BASED EVO® NYLON SOURCED FROM CASTOR BEANS, NOT FOSSIL FUELS, AND AN INNOVATIVE, FIRST-TO-MARKET PART PLANT-BASED ELASTANE FOR ADDED STRETCH. THEY ARE TREATED WITH NATURAL PEPPERMINT OIL (PPRMINT™) FOR ITS ANTI-ODOR PROPERTIES.