The Kosto VPKF70 winter pants are designed to deliver high-performance protection in harsh industrial environments where arc-flash hazards, hydrocarbon flash fires, cold temperatures, and low-visibility working conditions converge. Built from a flame-retardant cotton canvas laminated with a waterproof and breathable membrane, these insulated pants help maintain comfort and mobility in winter conditions down to –20°C. Their rugged construction, 4" FR K-Brite reflective tape, and integrated suspenders ensure full-body coverage and reliable visibility, making them an essential lower-body layer for electrically classified work zones and outdoor winter operations.

Key Features

FR winter shell construction: 99% FR cotton canvas laminated with a waterproof/breathable membrane (5000 mm / 3000 mvp) blocks wind, moisture, and snow for reliable winter protection.
Insulated for sub-zero conditions: FR cotton lining and 200 g/m² modacrylic/polyester insulation help retain body heat in temperatures down to –20°C.
CAT 4 arc-flash protection: Delivers ATPV 40 cal/cm² performance for high-risk electrical environments.
4" FR K-Brite reflective tape: Enhances visibility in low-light or dynamic outdoor work conditions.
Reinforced heat-sealed seams: Improve weather resistance and durability in demanding field work.
Functional pocket layout: Includes four pockets—on the bib, back, and sides—for storage of tools and essential equipment.
Adjustable elastic suspenders: Provide secure fit, comfort, and full-body coverage.
Leg zippers with protective flap: Allow easy donning over work boots and layered winter garments.

Intended Use

These winter FR pants are intended for workers who require a combination of arc-flash protection, flame resistance, cold-weather insulation, and enhanced visibility during outdoor or electrically classified tasks. Designed to integrate seamlessly with the VMKF70 coat, they support safe and comfortable winter operations.

Electrical utilities and power distribution
Oil & gas, petrochemical, and refinery operations
Mining, smelting, and heavy industrial processing
Outdoor construction and maintenance in winter
Emergency response and winter linework
High-risk environments requiring CAT 4 arc-flash PPE

Product Specifications:

Product Code: VPKF70
Shell Fabric: ,99% FR cotton canvas, 280 g/m² and 1% antistatic fiber
Waterproof/breathable membrane: 5000 mm / 3000 mvp
Lining: 100% FR cotton, 170 g/m²
Insulation: 85% modacrylic / 15% polyester, 200 g/m²
Reflective Tape: 4" FR K-Brite
Temperature Rating: -20°C

Design Details:

Adjustable elastic suspenders
Zipper with flap
Zippers at legs
4 pockets (bib, back, sides)
High-strength waterproof heat-sealed seams


Certifications and Standards

NFPA 70E: Confirms suitability for energized electrical work requiring arc-flash PPE.
ASTM F1506 (ASTM F1959): Meets performance requirements for FR and arc-rated fabrics; includes tested ATPV results.
CAT 4, ATPV 40 cal/cm²: Highest arc-flash protection level for high-energy electrical environments.
CAN/CGSB 155.20-2017: Validates flash-fire protection for hydrocarbon exposure; includes successful manikin burn testing (ASTM F1930).
CSA Z96-22: Complies with Class 2 Level 2 high-visibility requirements; reaches Class 3 Level 2 when paired with VMKF70.
ANSI/ISEA 107-2020 Class E: Ensures visibility performance for lower-body PPE in demanding work zones.