A heat & flame resistant safety boot conforming to the EN 15090 HI3 F3A fire boot standard for flame resistance, radiant heat (20kW/m2) and heat insulation of the sole (250°C for 40 minutes). These boots are designed for use in areas where there is a risk of sparks from welding or grinding or for close proximity fire fighting.

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Isotec side & sole.jpg

Product Features

  • Chemically resistant boot certified to EN 13832-3:2018 (footwear protecting against chemicals)
  • Conforms to EN 15090:2012 F3A Fire fighter boot standard
  • Heat insulation of the sole EN 15090:2012 (HI3): The sole withstands 40 minutes at 250°C with an increase in internal temperature of less than 21°C after 10 minutes
  • Integral 200 Joule epoxy coated steel toecap and stainless steel penetration resistant mid-sole
  • Heat resistant sole EN 20345:2011 HRO, 60 seconds at 300°C
  • Cold insulation to EN ISO 20345:2011 CI
  • Optional thermal liner
  • Fuel and oil resistant sole
  • Vulcanized rubber sole for improved slip resistance - 30% better than a conventional safety boot sole
  • Durable, cut-resistant vulcanised rubber sole, significantly extends working life, even in harsh terrain
  • Cleated outsole for maximum grip in wet and oily conditions (SRC)
  • Energy absorbing tunnel system in heel to EN 20345:2011 E
  • Certified to the Marine Equipment Directive
  • Ergonomic cushioned insole (removable & machine washable) for greater wearer comfort
  • Seamless construction
  • Kick-off lug
  • Adjustable height
  • Knitted nylon lining
  • CE marked on the shaft with date and year of manufacture
  • REACH Compliant
  • Machine washable at up to 40°C
  • Shelf life of over 10 years
Chemical Permeation Data
Search by chemical name or CAS number:

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Chemical CAS Number ISOTEC
acetaldehyde 75-07-0 >480mins
acetic acid (> 99. 8%) 64-19-7 >480mins


Chemical Protective Footwear

EN 13832-3:2018 K,N,Q 

Personal Protective Equipment

PPE Regulation (EU) 2016/425

Safety Footwear 

EN ISO 20345:2011 - S5 CI HRO FO SRC

Footwear for Firefighters

EN 15090:2012 Type F3A

Marine Equipment Directive

2014/90/EU - MED/3.4 - Fire-Fighter’s Outfit: Boots


Commodity Code: 6402911000

UK 3 4 5 6 7 8 9 10 11 12 13 14 15
EU 35 36 37 39 41 42 43 44 45 46 47 49 50
US 4 5 6 7 8 9 10 11 12 13 14 15 16

Workmaster™ boots are generously sized as they are designed to accommodate wearers with thicker socks or a thermal lining. We recommend downloading the A3 Size Guide below to ensure the perfect fit.


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