Wiktionary
gel bracelet
n. A clear, plastic bracelet worn as a wristband; often embossed with a message of support for a cause
Wikipedia
Gel bracelet
Gel bracelets, or jelly bracelets are an inexpensive type of wristband often made from Silicone. They come in a variety of colors, and several can be worn on each arm. They have been popular in waves throughout the Western world and elsewhere since the 1980s. One style of these wristbands, known as "awareness bracelets", carry debossed messages demonstrating the wearer's support of a cause or charitable organization.