Crotch lined means that the item comes lined in the crotch area only. (Please note that if you are ordering a light colored item, we strongly advise that you order either fully front lined or fully front and back lined to avoid transparencies.)
Streamline is a high technology fabric designed to reduce drag by its water repellent stripes. This fabric is knitted 76% polyester, 24% spandex, 240 grams per square meter, with water repellent resin stripes. Streamline is sleek and smooth to the touch. It is a denser fabric than PolyFlex.