Electrostatic Discharge Beanie Warmer Unisex The "Electrostatic Discharge Beanie Warmer" is a multi-functional item knitted with three types of yarn: cotton, "Solvair conductive acrylic fiber," and "Virucidal antibacterial Eletex II," and is recommended for outdoor sports and trekking. It's a 3-way product that can be used as a neck warmer to keep your neck warm, as a face cover worn over a mask, or as a knit cap to improve hair shine.