Understanding EN ISO 20345

25 June 2021

EN ISO 24035 is the specification for safety footwear with suitable characteristics for protecting the wearer from injuries that may occur in the professional settings for which the footwear is designed, with toe caps for impact protection. Footwear conforming to this standard is tested at an impact energy level of 200 joules (J).

There are two classes of safety footwear, defined by the materials with which the footwear is made:

Class I – Leather and other materials, excluding all-rubber and all-polymeric footwear

Class II – All-rubber and all-polymeric footwear

The footwear is then marked with the appropriate category depending on its class and safety features:

SBI or IIPass the Basic Requirements for Safety Footwear
S1ISB plus Closed Seat Region, Antistatic Properties & Energy Absorption of Seat Region
S2IS1 plus Water Penetration & Water Absorption Properties
S3IS2 plus Penetration Resistance & Cleated Outsole
S4IISB plus Antistatic Properties & Energy Absorption of Seat Region
S5IIS4 plus Penetration Resistance & Cleated Outsole

Some applications for safety footwear may also have additional requirements for the footwear to be compliant:

P – Penetration Resistance

CI – Cold Insulation of Sole Complex

C – Conductive Footwear

E – Energy Absorption of Seat Region

A – Antistatic

WR – Water Resistance

E – Electrically Insulating

M – Metatarsal Protection

HI – Heat Insulation

AN – Ankle Protection

Requirements for the Shoe Upper:

WRU – Water Penetration and Absorption

CR – Cut Resistance

Requirements for the Outsole:

HO – Resistance to Hot Contact

For more information about PPE & Workwear standards and specifications, you can download our PPE & Workwear Standards guide here.

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