This is a work shoe standard provided by the European Union. The
code can be broken down into separate parts, as follows.
EN ISO 20345:2004
EN = European Union
ISO = International Organization for Standardization
20345 = Unique code for this standard
2004 = The year the code was created or revised
In the past decade, the EN ISO 20345:2004 standard was withdrawn
and replaced with EN ISO 20345:2007 and then EN ISO 20345:2011.
The purpose of the EN ISO 20345 standard is to regulate and provide
requirements for the manufacturers of safety footwear. The type
of things covered in the standard are; toe protection from falling
objects, midsole protection from sharp objects penetrating the sole,
resistance to heat on the outsole, and water and oil resistance.