Sequins are small, flat, round-shaped pieces of a shiny plastic or metal, which are generally sewn onto clothing or footwear to reflect light and add shimmer.
About Slides:
A backless, open-toed shoe that is generally a type of sandal. Slides can be high heeled, flat heeled, or somewhere inbetween; may cover nearly the entire foot from ankle to toe; or may have only one or two narrow straps.