GripWalk is a standard used by marker/dalbello/volkl and is technically not compatible with WTR. I've seen people jam Dalbello lupo ti's with gripwalk soles into marker bindings that are not grip walk compatible (Jester pro's in this instance) and even when I lowered the afd on my Jester pro's all the way, my Dalbello lupo AX's didn't fit right, and actually ate away at the plastic a little. I currently run alpine soles on my Lupo AX's, and fit them to FKS 180's and couldn't have made a better choice. I can use my boots in my kingpins and have only ejected out of my FKS's when I needed to. It's an overly complicated system, and no one wants to agree to a standard, so be careful what boots you're matching to what bindings, and consult a shop (or ask in this thread) about specific gear combos.