The Thick Pad harness can be used to replace the standard harness on most Eberlestock packs. Choose it if you prefer a little bit more plush padding vs. the more minimalist padding in our standard "Shooters Harness." Works on all packs with removable harness except those with mid-back kidney pads attached to the harness (i.e, its not recommended for J117, J79, V69/90, etc.).
Worth the money especially when you put some weight on the pack. I prefer the extra padding as I like comfort over the shooting harness.