Understanding Special Protection Markings
FO, CI, and HI are special feature markings on safety boots under EN ISO 20345. These markings indicate specific protective properties beyond basic requirements, allowing workers to select boots suited for particular environmental conditions.
FO - Fuel Oil Resistant
FO marking indicates the outsole is resistant to fuel and oil. The rubber compound will not deteriorate when exposed to petroleum-based substances, preventing degradation and maintaining slip resistance.
CI - Cold Insulation
CI marking means the boot provides insulation against cold. This protects feet in refrigerated environments, cold storage, outdoor winter work, and activities where cold exposure could cause discomfort or injury.
HI - Heat Insulation
HI marking indicates heat insulation from the outsole. Boots with HI rating protect feet from hot environments like foundries, welding, and high-temperature industrial settings.
TIPOur safety boots with FO, CI, and HI markings provide specialized protection for extreme work environments.