A snap fastener (also called press stud, popper, snap or tich) is a pair of interlocking discs, made out of a metal or plastic, commonly used in place of buttons to fasten clothing and for similar purposes. A circular lip under one disc fits into a groove on the top of the other, holding them fast until a certain amount of force is applied. Different types of snaps can be attached to fabric or leather by riveting with a punch and die set specific to the type of rivet snaps used (striking the punch with a hammer to splay the tail), sewing, or plying with special snap pliers.
Snap fasteners are a noted detail in American Western wear and are also often chosen for children's clothing, as they are relatively easy for children to use.
Modern snap fasteners were first patented by German inventor Heribert Bauer in 1885 as the "Federknopf-Verschluss", a novelty fastener for men's trousers. Some attribute the invention to Bertel Sanders, of Denmark. These first versions had an S-shaped spring in the "male" disc instead of a groove. Australian inventor Myra Juliet Farrell is also credited with inventing a 'stitchless press stud' and the 'stitchless hook and eye.' In America, Jack Weil (1901–2008) put snaps on his iconic Western shirts, which spread the fashion for them. The Prym-company produces snap fastners since 1903.
In the famous Chinese Terracotta Army, dating from 210 BC, the horse halters of wagons, made of a gold tube and a silver tube, were joined with a form of snap fasteners.
Press studs were worn by rodeo cowboys from the 1930s onwards, because these could be quickly removed if, in the event of a fall, the shirt became snagged in the saddle. Pearl snaps entered American mainstream Western fashion during the 1950s, when singing cowboys like Gene Autry and Roy Rogers incorporated them into their embroidered and fringed stage shirts. The most desirable shirts were unique creations tailored by Nudie Cohn or Rodeo Ben, but commercially produced Western clothing could be purchased from companies like Wrangler, Levi Strauss, Panhandle Slim, Rockmount Ranch Wear, H Bar C, or Roper.