Hi vis jackets are crucial safety gear designed to make workers easily visible in environments where visibility is a concern. These jackets are commonly used in industries such as construction, road work, and emergency services, where workers are often exposed to traffic, heavy machinery, or low-light conditions.

Hi-vis jackets are typically made from fluorescent materials in bright colors like neon yellow, orange, or lime green. These colors are chosen for their ability to stand out in various lighting conditions, making the wearer more noticeable during daylight hours. To enhance visibility further, hi-vis jackets often include reflective strips that catch and reflect light from sources such as vehicle headlights, ensuring the wearer is visible even at night or in low-light situations.

The design of hi-vis jackets is governed by safety standards that specify the required levels of visibility. For example, the American National Standards Institute (ANSI) sets guidelines in the United States for the placement and width of reflective strips and the minimum amount of high-visibility material used.