High-visibility sweatshirts are a type of workwear designed to increase visibility and safety in low-light conditions. They are typically made from high-visibility fluorescent materials, often in yellow or orange, and feature reflective stripes or tape to reflect light. 

High-visibility sweatshirts are commonly worn by outdoor workers, such as construction workers, road maintenance workers, and warehouse workers. They are available in different styles and designs, such as hooded, zip-up, and pullover. The sweatshirts are often made from breathable and moisture-wicking materials to keep workers comfortable and dry during physical activities. Some high-visibility sweatshirts may also come with additional features, such as pockets, adjustable cuffs, and hoods, to increase functionality and convenience.