A PVC/NBR life vest is a type of personal flotation device (PFD) that is made from a combination of PVC (polyvinyl chloride) and NBR (nitrile butadiene rubber) materials. As a form of rubber life jacket, the PVC/NBR life vest is a durable and versatile personal flotation device that combines the strength and water resistance of PVC with the flexibility and cushioning properties of NBR. It is usually used on offshore platform projects.