Overshirt in cotton & nylon poplin with COMPACT treatment The Compact Process comes from the treatment used on military uniforms, which were sewn in prisons & then washed at temperatures above 130˚C. Garments treated in this way shrunk so much that they had to be made 50% bigger. Stone Island uses this treatment to create a range of unique fabrics. Garments made from this material are easy to iron & do not wrinkle easily.