• Class 2 insurers is a term sometimes used in the context of uninsured motorists (UM) and underinsured motorists (UIM) coverage to refer to insured persons (such as guests in an insured vehicle) other than named insureds and specified insured persons. family members (called class 1 insured). Class 1 policyholders may be provided with broader coverage than class 2 policyholders, especially with regard to cumulative limits.