Hi-visibility (hi-vis) jackets are essential personal protective equipment (PPE) designed to make wearers easily noticeable in low-light, high-traffic, or hazardous environments. They are typically constructed from fluorescent materials (such as polyester or mesh) in bright colors like neon yellow, orange, or lime green, which stand out during daylight. At night or in poor lighting, reflective tape or strips reflect light from vehicles or other sources, further improving visibility.

These jackets often comply with safety standards (e.g., EN ISO 20471, ANSI/ISEA 107) and are used by construction workers, road maintenance crews, warehouse staff, emergency responders, and cyclists. Features may include weather resistance, breathability, pockets, and adjustable fits. Hi-vis jackets help prevent accidents by ensuring workers are seen in dim or high-risk conditions.