More than half our body heat is lost from our heads. The Occunomix Shoulder Length Winter Hard Hat Liner - SB505 features a DuPont Thermotex micro-porous ear barrier to block wind, water, and cold. The elastic at the forehead provides a snug fit to ensure a gap-free fit. Reflective silver strip in back, a little extra protection in traffic zones. And, except where noted, all models are flame retardant, have hook and loop fasteners, and have chin straps made of flame resistant polyester. None contain metal parts. Warming Pack Pockets at ears to hold Hot Rods Warmers (warmers not included).