Maxit 102625809 Z-Beanie Thermal Hat, 8-1/2" Length x 8" Width x 1/8" Height, Black The warmest 1 ounce hat on the market Soft, stretchable and breathable fabric can be worn over the ears without impeding your ability to hear 4-panel construction with comfortable, durable, flat-lock stitching Provides maximum protection against cold and wind with unsurpassed moisture management properties Fits comfortably under any style of hat, hard hat or helmet