Kit Kat is a chocolate-covered wafer bar created by Rowntree's of York and now produced globally by Nestlé. It consists of layers of wafer separated and covered by chocolate. In recent years, Kit Kat faced a crisis as its four-finger shape trademark was annulled in the EU. However, Nestlé has introduced many new variants of Kit Kat around the world to boost sales, such as luxury Kit Kat Rubies launched in Malaysia, using premium ingredients. While some have criticized ingredients like palm oil, Nestlé aims to achieve sustainable sourcing.