Alpha Industries Men's N-3B Parka. When you need serious wind and cold protection, you need the Alpha N3-B Parka. It's designed for those who face the toughest of conditions, from harsh winds to heavy rains, while keeping the wearer warm and dry so he can get the job done. Issued to air crews assigned to helicopters, troop transports, and strategic bombers, it's made with even the most rough and tumble of assignments in mind, so you can rest assured that you are well protected from the elements while still maintaining freedom of movement while you work. Water repellent materials keep you dry, while the nylon lining keeps warmth close to your body.