The conventional knitting polyester reflective vest is a type of safety vest that is used to make the wearer more visible in low light conditions. It typically consists of a vest made of a conventional knit polyester fabric, which is a type of fabric that is created using a standard knitting process and is made of synthetic polyester fibers.
It is designed with a reflective material (usually reflective tape) attached to it, which can reflect light back to its source, making the wearer more visible to drivers and other people in low-light conditions.

https://www.ankai.net/product/reflective-vest/conventional-knitting-polyester-reflective-vest.html