Why should you choose S3 if the safety class S5 already covers all eventualities? Well, S3 shoes are more attractive than their S5 counterparts, because they are offered in a variety of finishes like leather, textile, microfibre and more – and they are available in various colours. What’s more: they are extra comfortable. A plastic or rubber exterior is required for S5 to guarantee 100% waterproofing. S3s, however, only have to offer membrane-aided waterproofing up to 60 minutes, which means they are more breathable.