Several lasting innovations in bracelet design occurred in the last decade. Silver became the most common material for link bracelets, cuffs and bangles. This trend started in the 20th century when manufacturers mass-produced silver jewelry, which was less expensive than gold but still had the sparkle of a precious metal that buyers loved. The preference for silver over yellow extended to industrial metals, such as silvery grey steel, titanium and tungsten. Industrial metals are now the dominant material in men's bracelets. As the green-living movement grows, more people are demanding natural materials in their wardrobe; to learn more, read our guide on the best bracelets inspired by nature. Finally, today's young people often wear simple bracelets to support social causes and showcase group identity; their banner can be a colorful rubber band, dangling charm or even a piece of string.Frequently, it is made in a decorative style, and is worn as jewelry. It may have a supportive function, such as holding a wristwatch or other items of jewelry such as religious symbols or charms. Medical and identity information is marked on some bracelets, such as allergy bracelets, hospital patient-identification tags, and bracelet tags for newborn babies. If a bracelet is a single, inflexible loop, it is often called a bangle. When it is worn around the ankle it is called an ankle bracelet or anklet. A boot bracelet is used to decorate boots. Colloquially, handcuffs are sometimes called bracelets. Bracelets can be manufactured from metal, leather, cloth, plastic or other materials and sometimes contain jewels, rocks, wood, shells, crystals, metal or plastic hoops, pearls and many more materials.