Abstract: A winter liner system, including a hunter knit liner for wear underneath a protective helmet. The hunter knit liner fully encircles, and partially covers, the head of the wearer and includes a decorative exterior layer, an interior layer, and an interior foam layer sandwiched therebetween. The liner has two ear flaps extending downwardly to cover ears, and a looping band on each ear flap for holding the chinstrap of the helmet. At least one ear flap includes a side pocket integrated therein. The liner includes an elongated bill extending downwardly and horizontally across the front portion. The bill has an exterior surface which adheres directly to the front of the helmet. A plurality of snapping mechanisms, which include male snap heads embedded within the helmet and cooperating female snap receptacles integrated into the liner, removably securing the liner into the helmet.