The 'S' stands for 'stitching' - as in contrast stitching - which is what you get with the 104S. The same great snapback trucker that you're used to, now with a little extra.
CROWN: Mid-Profile, Pro-Model
FABRIC: Cotton Blend, Trucker Mesh
Color: Heather Grey/Lt Charcoal/Heather Grey
Design: There's No Crying In Baseball
Brand: Pacific Headwear
Cap Style: 104S