Vintage Cold Proof Insulated Thermal Underwear Long Sleeve Shirt - Size is Large, 42-44. 

Thick shirt insulated with Nylon Tricot Shell, Dupont Dacron  88 Fiberfill Insulation, thermal lining.

Still in the packaging, never opened or used!  color is off white or yellowish white due to age,

Please see pictures before bidding - from the 1970's I believe,