Good question! The key to long lasting and sustainable underwear is washing and drying it correctly, so that you can rely on it every day, without any loss of comfort or usability. Always try to wash your eco-friendly underwear using natural detergents. If possible, it’s also best to air dry your sustainable underwear, either on a line or lying flat, on a clean surface, in the sun. The latter technique avoids newly washed underwear stretching out of shape.