USAF GI Spec N3B Flying Man’s Jacket. 24 pit to pit. GI SPEC N3B PARKA. Shell and Lining made from 100% Nylon. Interlining is made from 100% Bonded Polyester. 4 Large Buttons On Front Of Coat With Button Loops. Zipper With Storm Flap. 4 Front Pockets (Two Front Slash Pockets With 2 Hidden Snaps On Each, And Two Inset Lower Pockets With Flaps – One Hidden Snap On Flap). Zippered Utility Pocket With Pen Pockets On Left Arm. Extremely Warm and comfortable.