The Kosto THKF35 / THKF65 FR Beanie is a lightweight, comfortable winter headwear solution designed for industrial environments where both cold-weather protection and arc-flash safety are required. Built from a soft interlock knit blend of modacrylic, cotton, aramid, polyamide, and antistatic fibers, it provides breathable warmth without compromising flame-resistant performance. The beanie fits easily under safety helmets, making it ideal for winter operations where workers need reliable thermal insulation while maintaining compliance with electrical safety standards.

Key Features

Inherent FR interlock fabric: Modacrylic, cotton, aramid, polyamide, and antistatic fibers provide durable FR performance without chemical treatments.

Arc-flash protection: CAT 2 rating with ATPV 13 cal/cm² supports use around electrical hazards.

Breathable thermal comfort: Lightweight knit construction retains warmth while preventing overheating during physical work.

Helmet-friendly fit: Designed to be worn under safety helmets, including TCK10 models, without discomfort.

Stretchable construction: Flexible knit adapts to different head shapes and ensures a secure, comfortable fit.

Cold-weather coverage: Protects the head from wind and low temperatures for improved comfort during winter tasks.

Intended Use

This FR beanie is intended for workers performing winter tasks where thermal insulation must be combined with flame-resistant and arc-flash protection. It serves as a protective layer worn under safety helmets in outdoor or electrically classified work zones.

Ideal for:

Electrical utility and power distribution crews
Outdoor construction and industrial maintenance
Oil & gas and petrochemical operations
Mining, smelting, and processing sites
Workers exposed to wind, cold, or winter weather

Product Specifications

Product Codes: THKF35, THKF65
Color Options: Black (THKF35), Orange (THKF65)
Material: 49% modacrylic, 42% cotton, 5% aramid, 3% polyamide, 1% antistatic
Weight: 7.3 oz/yd² (247 g/m²) interlock fabric
Arc Flash Protection: Category 2, ATPV 13 cal/cm²
Size: Universal (Width: 24 cm / 9.5 in, Length: 27.5 cm / 10.8 in)
Care Instructions: Machine wash at 40°C; do not bleach; avoid chlorine/phosphate detergents; low-temperature ironing; hang to dry.

Certifications and Standards

ASTM F1506 — Flame-resistant clothing performance requirements
ASTM F1959 — Arc-flash rating
NFPA 70E — Electrical safety in the workplace
Arc-flash protection: CAT 2, ATPV 13 cal/cm²