Consumers in Pennsylvania are entitled to bring suit for harm caused by a defectively designed product using one or both of these legal tests: "the consumer expectation test" (CET) or "the risk-benefit test" (RBT). Each test or definition of defect considered by a jury has its particular elements of proof and applying those elements to build your case can be daunting and expensive—because they are almost always expert witness dependent. To help understand and appreciate the steps required to develop and try a products case using the RBT, we provide this account of a recently litigated defectively designed helmet case.