Lastex is a type of elastic yarn, consisting of a rubber core surrounded by wool, rayon, silk or cotton threads. It can be stretched one way or more, depending whether elastic thread is used only in the warp, or in both warp and weft, or in a net. Exist many different Lastex fabrics such as batiste lastex, satin lastex, lace lastex, and a leno lastex. Lastex was introduced in the trademark in 1931 and was primarily used for swimwear, brassieres, girdles and corselettes.