It keeps you safe without weighing you down. The Propper CWU 27/P Aramid Flight Suit is built to military specification YACL-WP PD 99-01 R as worn by all U.S. flight crews. Our suit features a two-way zipper with pull, six primary pockets, an adjustable waist belt with hook and loop closure, felled seams, and a bi-swing back.