Description Upper – Nappa Action Leather Toecap – Composite Lining – Cambrella Standards – ASTM F2413:2018 – EN ISO 20345:2011 S3 ESD SRC Outsole – PU/PU Midsole – Anti-puncture Textile Footbed – SJ foam footbed Size Range – EU , UK , US , CM ESD provides the controlled discharge of electrostatic energy that can damage electronic components and avoids risks of ignition resulting from electrostatic charges. Volume resistance between 100 KiloOhm and 35 MegaOhm. Metalfree and lightweight, no thermal or electrical conductivity. Metalfree puncture resistant material, which is lighter and more flexible than steel. The material is not thermal conductive. Covers 100% of the surface of the last bottom. S3 safety shoes are suitable for work in an environment with high humidity and presence of oil or hydrocarbons. These shoes also protect against perforation risk of the sole, and foot crushing.