The comparison table of HPD (hearing protection devices) is a tool with 21 criteria (economical aspect, set up, use, comfort, performance, etc.) to classify the type(s) of hearing protection devices that are most suited to a situation, environment, etc. A score is assigned to the hearing protection devices for each criterion. This allocation is described in the explanatory documentation, which can be accessed by clicking on the link below. Some values can be modified to be better suited to your specific case. Similarly, each criterion may be weighted according to your own criteria.