Manufacturer Part Number (MPN) : 1318607001OSFAPerferation at mouth to allow for breathability. ColdGear infrared technology uses soft, thermo-conductive inner coating to absorb & retain your own body heat. Ultra-soft knit fabric with a smooth exterior and a plush interior for just the right amount of warmth. Form-fitting balaclava construction is light, thin & breathable. Offers full facial protection that extends below the neck & can convert to a neck gaiter. Perforations on fabric in front of mouth for enhanced breathability. Smooth, chafe-free flatlock seam construction for zero distractions.