Actually,
For winter/mountain ops, the Marines are using a 4 man dome tent done by North Face.
For individual winter kit, we get issued:
Lightweight Capilene top & bottom base layers (very similar to CF long undies, but ours are coyote brown in color)
Polartec 100 weight pullover (olive green, but newer ones are coyote brown)
Polartec 300 jacket and overalls (black, but newer ones are coyote brown)
Outdoor Research Polartec toque (coyote brown)
Polartec neck gaitor (coyote brown)
Polartec contact gloves (coyote brown)
Outdoor Research Pro-Modular Gloves (Gore-Tex shell glove with polyester pile glove insert)
Gore-Tex Gen 2 ECWCS shell jacket and trousers (now being replaced with Marpat Gore-Tex jacket & trousers)
Rubber Vapor Barrier 'Mickey Mouse' boots (although an insulated overboot is being trialed).