Nike Shox are a line of shoes known for their unique cushioning system, which uses four flexible, spring-like columns in the heel to absorb impact and provide energy return. Introduced in 2000, the design features these "Shox Pillars" that compress and regain their shape, often with a TPU cage for added stability. The line includes popular models like the Shox R4 and the Shox TL, which are available in various styles and are known for being both comfortable and visually distinctive.