Working in a cool wind with only a hard hat for protection can freeze your ears off, and balancing your hard hat on your beanie means it slides all over the place rendering it unsafe. The ProChoice Safety Gear Hard Hat Winter Liner features velcro fasteners that easily attach to the hard hat harness and prevent it from slipping. Made from warm, soft and washable thermo-knit, this hard hat liner is sure to keep your hard working ears warm and is a safety must-have for the Winter Season.