Google Express is a same-day shopping service from Google that taps into popular retailers such as REI, Target, and Whole Foods among others and gets items delivered in just a few hours. Material design is a concept based on the fundamentals of light, surface, and movement and is the single underlying system that allows a unified experience across platforms and devices on all Google products. Google Express went through a complete redesign effort in order to bring a unified visual language that synthesizes the classic principles of good design.