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.

Ideal for:

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
Sizes: XS to 5XL
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.