[Fits Comfortably with a Hard Hat] — One size fits all beanie that offers durable, highly wind-resistant warmth without sacrificing comfort or protection and is designed to be worn underneath a hard hat or by itself. [Highly Wind Resistant Fleece Construction] — Single-layer fleece with flat-lock seams constructed from proprietary DragonWear Super Fleece FR fabric with 2 times more wind resistance than comparable fleece fabrics. [CAT and Arc Rated] — Dual Hazard certified to meet both NFPA 70E (Standard for Electrical Safety in the Workplace) and NFPA 2112 (Standard on Flame-Resistant Garments for Protection of Industrial Personnel Against Flash Fire) with CAT 4 (Category IV) and Arc 40 cal/cm² rating. Design for utility, industrial safety, electrical, and oil & gas workers. [Long Lasting Durability] — Durable wash and wear performance that's UV fade resistant with permanent protection that won't melt, drip, or support combustion in the air and cannot be washed out or worn away with extended use. Made in USA NFPA 70E, NFPA 2112 Lightweight and fire-resistant warmth that's easy to keep handy for when the temperature drops. Designed to be worn under a hard hat or by itself, this go-to fleece beanie offers durable, highly wind-resistant warmth without sacrificing any comfort or protection. As an inherently FR garment, the fabric won't melt, drip, or support combustion in the air, cannot be washed out or worn away and is highly resistant to UV light fading. Perfection!