Safety shoe ESD S3 high without metal with TLS fastener. The metal-free version of the safety shoe Cador S3. FLOW S3 is slip-resistant SRC and features ESD, a composite toe cap, a penetration-resistant midsole and many other advantages. Thanks to the Twist Lock fastening system, you only need to twist and lock to tighten these safety shoes in no time at all. Waterproof, they are ideal for dry or wet environments.