These are extremely stretchy and comfortable they are really cheeky. These are designed similar to Dancewear whether or not you're using them for performance they are made to be comfortable and cute to move in. I'm not sure what the fiber content is here but if I would guess it's a polyester spandex blend and it's a little bit thicker so it does not require any lining this could also probably be used for swimwear as it dries very quickly