In knitting, crochet and other textile arts, blocking is a final stage of handmade textile production that adjusts the shape of the finished piece. Not all pieces need blocking; however, blocking is standard for lace work and is not uncommon in sweaters, socks, and other solid projects. Through heat and moisture, blocking sets the stitches and standardizes the final dimensions, and may enhance the drape. Hand manufacture places natural stresses on fabrics that may result in deviations from its intended shape and size. Blocking is only effective on natural fibres but a technique called "killing" may be used on synthetic fibres to achieve an effect similar to blocking.