The terms roving and yarn are widely used. A roving is a collection of untwisted strands wound together. A yarn is a generic term for a continuous strand of textile fibres, filaments in a form suitable for knitting, weaving or intert wining to form a textile fabric. Yarn-based fabrics generally give higher strengths per unit weight than rovings, and being generally finer, produce fabrics at the lighter end of the available weight range. Woven rovings are less expensive to produce and can wet out more effectively. However, since they are available only in heavier texes, they can only produce fabrics at the medium to heavy end of the available weight range, and are thus more suitable for thick, heavier laminates.