Hairpin lace is a type of crocheted fabric formed by using a crochet hook and a hairpin, which consists of two parallel metal rods held at the top and the bottom by removable bars. Historically, a metal U-shaped hairpin was used, from which the name originates.
Hairpin lace is formed by wrapping yarn around the prongs of the hairpin to form loops, which are held together by a row of crochet stitched worked in the center, called the spine. The resulting piece of lace can be worked to any length desired by removing the bottom bar of the hairpin and slipping the loops off the end. The strips produced by this process can be joined together to create an airy and lightweight fabric.