PPS stands for Preflight Planning System and for Patches, Print and Seams, which in turn stands for a fashionable update on an original iconic Alpha style. In this case, the N3B jacket receives a make-over. Although the original is an authentic item of military wear, it became quite popular beyond the confines of the army. Alpha still offers the original N3B; however, should you seek a more contemporary parka that still retains the functionality and comfort of original military chic, the PPS version might just be the one for you.